diff --git a/.appveyor.yml b/.appveyor.yml
index a4f30cc5..c447a9ca 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -20,10 +20,11 @@ build_script:
   - mkdir build
   - cd build
   - cmake -DSIMDJSON_BUILD_STATIC=%SIMDJSON_BUILD_STATIC% -DSIMDJSON_ENABLE_THREADS=%SIMDJSON_ENABLE_THREADS% -DCMAKE_BUILD_TYPE=%Configuration% -DCMAKE_GENERATOR_PLATFORM=x64 -DSIMDJSON_GOOGLE_BENCHMARKS=OFF ..
-  - cmake --verbose --build . --config %Configuration%
+  - cmake -LH ..
+  - cmake --build . --config %Configuration% --verbose
 
 test_script:
-  - ctest --verbose --output-on-failure -C %Configuration%
+  - ctest --output-on-failure -C %Configuration% --verbose
   
 matrix:
   fast_finish: true
diff --git a/.gitignore b/.gitignore
index 6fd32b0f..25bf6d4d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -87,6 +87,7 @@ objs
 /examples/quickstart/twitter.json
 /fuzz/fuzz_dump
 /fuzz/fuzz_dump_raw_tape
+/fuzz/fuzz_minify
 /fuzz/fuzz_parser
 /fuzz/fuzz_print_json
 /get_corpus_benchmark
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5c292cbc..a5606f2c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,8 +20,8 @@ set(SIMDJSON_LIB_SOVERSION "1" CACHE STRING "simdjson library soversion")
 
 if(MSVC)
   option(SIMDJSON_BUILD_STATIC "Build a static library" ON) # turning it on disables the production of a dynamic library
-  set(SIMDJSON_COMPETITION CACHE STRING "Compile competitive benchmarks" OFF)
-  else()
+  option(SIMDJSON_COMPETITION "Compile competitive benchmarks" OFF)
+else()
   option(SIMDJSON_BUILD_STATIC "Build a static library" OFF) # turning it on disables the production of a dynamic library
   option(SIMDJSON_COMPETITION "Compile competitive benchmarks" ON)
 endif()
@@ -104,6 +104,22 @@ if(${CMAKE_C_COMPILER_ID} MATCHES "Intel") # icc / icpc
   set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -static-intel")
 endif()
 
+# Workaround for https://gitlab.kitware.com/cmake/cmake/issues/15415#note_633938:
+function(export_private_library NAME)
+  install(TARGETS ${NAME}
+    EXPORT ${NAME}-config
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+  )
+  install(EXPORT ${NAME}-config
+    FILE ${NAME}-config.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/simdjson-private
+  )
+endfunction()
+
+export_private_library(simdjson-flags)
+
 #
 # Create the top level simdjson library (must be done at this level to use both src/ and include/
 # directories)
diff --git a/HACKING.md b/HACKING.md
index a1d9d0a5..b3455a3e 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -26,8 +26,10 @@ simdjson's source structure, from the top level, looks like this:
     compiled multiple times, from whichever architectures use them. They assume they are already
     enclosed in a namespace, e.g.:
     ```c++
-    namespace simdjson::haswell {
-      #include "generic/stage1_find_marks.h"
+    namespace simdjson {
+      namespace haswell {
+        #include "generic/stage1_find_marks.h"
+      }
     }
     ```
 
diff --git a/examples/quickstart/CMakeLists.txt b/examples/quickstart/CMakeLists.txt
index edf3a054..59d89f83 100644
--- a/examples/quickstart/CMakeLists.txt
+++ b/examples/quickstart/CMakeLists.txt
@@ -2,51 +2,56 @@
 # Quickstart compile tests don't require any flags
 #
 
-# TODO run amalgamate first!
-
-function(add_quickstart_test TEST_NAME SOURCE_FILE)
-  # Second argument is C++ standard name
-  if (${ARGV2})
+# TODO haven't quite decided the right way to run quickstart on Windows. Needs README update.
+if (NOT MSVC)
+  # TODO run amalgamate first!
+  function(add_quickstart_test TEST_NAME SOURCE_FILE)
+    # Second argument is C++ standard name
     if (MSVC)
-      set(QUICKSTART_FLAGS /std:${ARGV2})
+      if (${ARGV2})
+        set(QUICKSTART_FLAGS /std:${ARGV2})
+      else()
+        set(QUICKSTART_FLAGS /WX)
+      endif()
+      set(QUICKSTART_INCLUDE /I${PROJECT_SOURCE_DIR}/include /I${PROJECT_SOURCE_DIR}/src ${PROJECT_SOURCE_DIR}/src/simdjson.cpp)
     else()
-      set(QUICKSTART_FLAGS -Werror -std=${ARGV2})
+      if (${ARGV2})
+        set(QUICKSTART_FLAGS -Werror -std=${ARGV2})
+      else()
+        set(QUICKSTART_FLAGS -Werror)
+      endif()
+      set(QUICKSTART_INCLUDE -I${PROJECT_SOURCE_DIR}/include -I${PROJECT_SOURCE_DIR}/src ${PROJECT_SOURCE_DIR}/src/simdjson.cpp)
     endif()
-  else()
-    if(MSVC)
-      set(QUICKSTART_FLAGS "")
-    else()
-      set(QUICKSTART_FLAGS -Werror)
+
+    # Third argument tells whether to compile with -fno-exceptions
+    if (${ARGV3})
+      if (NOT MSVC)
+        set(QUICKSTART_FLAGS ${QUICKSTART_FLAGS} -fno-exceptions)
+      endif()
     endif()
+
+    message(STATUS ${TEST_NAME})
+    add_test(
+      NAME ${TEST_NAME}
+      COMMAND ${CMAKE_CXX_COMPILER} ${QUICKSTART_FLAGS} -I${PROJECT_SOURCE_DIR}/include -I${PROJECT_SOURCE_DIR}/src ${PROJECT_SOURCE_DIR}/src/simdjson.cpp ${SOURCE_FILE}
+      WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/examples/quickstart
+    )
+    set_property(
+      TEST ${TEST_NAME}
+      APPEND PROPERTY DEPENDS simdjson-source ${PROJECT_SOURCE_DIR}/examples/quickstart/${SOURCE_FILE}
+    )
+  endfunction(add_quickstart_test)
+
+  if (SIMDJSON_EXCEPTIONS)
+    add_quickstart_test(quickstart quickstart.cpp)
+    add_quickstart_test(quickstart11 quickstart.cpp c++11)
+    add_quickstart_test(quickstart14 quickstart.cpp c++14)
+    set_property( TEST quickstart quickstart11 APPEND PROPERTY LABELS quicktests )
+    set_property( TEST quickstart14            APPEND PROPERTY LABELS slowtests  )
   endif()
 
-  # Third argument tells whether to compile with -fno-exceptions
-  if (${ARGV3})
-    if (NOT MSVC)
-      set(QUICKSTART_FLAGS "${QUICKSTART_FLAGS} -fno-exceptions")
-    endif()
-  endif()
-
-  add_test(
-    NAME ${TEST_NAME}
-    COMMAND ${CMAKE_CXX_COMPILER} ${QUICKSTART_FLAGS} -I${PROJECT_SOURCE_DIR}/include -I${PROJECT_SOURCE_DIR}/src ${PROJECT_SOURCE_DIR}/src/simdjson.cpp ${SOURCE_FILE}
-    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/examples/quickstart
-  )
-  set_property(
-    TEST ${TEST_NAME}
-    APPEND PROPERTY DEPENDS simdjson-source ${PROJECT_SOURCE_DIR}/examples/quickstart/quickstart.cpp
-  )
-endfunction(add_quickstart_test)
-
-if (SIMDJSON_EXCEPTIONS)
-  add_quickstart_test(quickstart quickstart.cpp)
-  add_quickstart_test(quickstart11 quickstart.cpp c++11)
-  add_quickstart_test(quickstart14 quickstart.cpp c++14)
-  set_property( TEST quickstart quickstart11 APPEND PROPERTY LABELS quicktests )
-  set_property( TEST quickstart14            APPEND PROPERTY LABELS slowtests  )
+  add_quickstart_test(quickstart_noexceptions quickstart_noexceptions.cpp "" true)
+  add_quickstart_test(quickstart_noexceptions11 quickstart_noexceptions.cpp c++11 true)
+  set_property( TEST quickstart_noexceptions APPEND PROPERTY LABELS quicktests )
+  set_property( TEST quickstart_noexceptions11 APPEND PROPERTY LABELS slowtests )
 endif()
-
-add_quickstart_test(quickstart_noexceptions quickstart_noexceptions.cpp "" true)
-add_quickstart_test(quickstart_noexceptions11 quickstart_noexceptions.cpp c++11 true)
-set_property( TEST quickstart_noxceptions APPEND PROPERTY LABELS quicktests )
-set_property( TEST quickstart_noexceptions11 APPEND PROPERTY LABELS slowtests )
diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
index 0b44920b..0dc69436 100644
--- a/include/CMakeLists.txt
+++ b/include/CMakeLists.txt
@@ -6,10 +6,7 @@
 #
 add_library(simdjson-headers INTERFACE)
 target_compile_features(simdjson-headers INTERFACE cxx_std_11) # headers require at least C++11
-target_include_directories(simdjson-headers INTERFACE
-  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
-  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
-)
+target_include_directories(simdjson-headers INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
 
 install(TARGETS simdjson-headers
         EXPORT simdjson-headers-config
diff --git a/include/simdjson.h b/include/simdjson.h
index 18f7327d..958291de 100644
--- a/include/simdjson.h
+++ b/include/simdjson.h
@@ -17,12 +17,12 @@
 #include "simdjson/document.h"
 #include "simdjson/document_stream.h"
 
-// Deprecated API
+// // Deprecated API
 #include "simdjson/jsonparser.h"
 #include "simdjson/parsedjson.h"
 #include "simdjson/parsedjson_iterator.h"
 
-// Inline functions
+// // Inline functions
 #include "simdjson/inline/document.h"
 #include "simdjson/inline/document_stream.h"
 #include "simdjson/inline/error.h"
diff --git a/include/simdjson/document.h b/include/simdjson/document.h
index 97baeea4..bf7c8310 100644
--- a/include/simdjson/document.h
+++ b/include/simdjson/document.h
@@ -10,7 +10,8 @@
 #include "simdjson/simdjson.h"
 #include "simdjson/padded_string.h"
 
-namespace simdjson::dom {
+namespace simdjson {
+namespace dom {
 
 class parser;
 class element;
@@ -23,9 +24,7 @@ class document_stream;
 /** The default batch size for parser.parse_many() and parser.load_many() */
 static constexpr size_t DEFAULT_BATCH_SIZE = 1000000;
 
-} // namespace simdjson::dom
-
-namespace simdjson {
+} // namespace dom
 
 template<> struct simdjson_result<dom::element>;
 template<> struct simdjson_result<dom::array>;
@@ -34,9 +33,7 @@ template<> struct simdjson_result<dom::object>;
 template<typename T>
 class minify;
 
-} // namespace simdjson
-
-namespace simdjson::internal {
+namespace internal {
 
 using namespace simdjson::dom;
 
@@ -90,9 +87,9 @@ public:
   size_t json_index;
 };
 
-} // namespace simdjson::internal
+} // namespace internal
 
-namespace simdjson::dom {
+namespace dom {
 
 /**
  * The actual concrete type of a JSON element
@@ -1087,7 +1084,8 @@ private:
   friend class document_stream;
 }; // class parser
 
-} // namespace simdjson::dom
+} // namespace dom
+} // namespace simdjson
 
 namespace simdjson {
 
diff --git a/include/simdjson/document_stream.h b/include/simdjson/document_stream.h
index 8d4504aa..b5ebf5fe 100644
--- a/include/simdjson/document_stream.h
+++ b/include/simdjson/document_stream.h
@@ -4,7 +4,8 @@
 #include <thread>
 #include "simdjson/document.h"
 
-namespace simdjson::dom {
+namespace simdjson {
+namespace dom {
 
 /**
  * A forward-only stream of documents.
@@ -140,6 +141,7 @@ private:
   friend class dom::parser;
 }; // class document_stream
 
-} // end of namespace simdjson::dom
+} // namespace dom
+} // namespace simdjson
 
 #endif // SIMDJSON_DOCUMENT_STREAM_H
diff --git a/include/simdjson/implementation.h b/include/simdjson/implementation.h
index 6277e736..60594a4b 100644
--- a/include/simdjson/implementation.h
+++ b/include/simdjson/implementation.h
@@ -218,7 +218,7 @@ private:
   std::atomic<T*> ptr;
 };
 
-} // namespace [simdjson::]internal
+} // namespace internal
 
 /**
  * The list of available implementations compiled into simdjson.
diff --git a/include/simdjson/inline/document.h b/include/simdjson/inline/document.h
index 833e4a28..8b66ff6f 100644
--- a/include/simdjson/inline/document.h
+++ b/include/simdjson/inline/document.h
@@ -189,9 +189,8 @@ inline size_t simdjson_result<dom::object>::size() const noexcept(false) {
 
 #endif // SIMDJSON_EXCEPTIONS
 
-} // namespace simdjson
 
-namespace simdjson::dom {
+namespace dom {
 
 //
 // document inline implementation
@@ -922,9 +921,8 @@ inline bool element::dump_raw_tape(std::ostream &out) const noexcept {
   return doc->dump_raw_tape(out);
 }
 
-} // namespace simdjson::dom
+} // namespace dom
 
-namespace simdjson {
 
 //
 // minify inline implementation
@@ -1104,9 +1102,8 @@ inline std::ostream& minify<simdjson_result<dom::object>>::print(std::ostream& o
 
 #endif
 
-} // namespace simdjson
 
-namespace simdjson::internal {
+namespace internal {
 
 //
 // tape_ref inline implementation
@@ -1173,7 +1170,7 @@ really_inline uint32_t internal::tape_ref::scope_count() const noexcept {
 
 template<typename T>
 really_inline T tape_ref::next_tape_value() const noexcept {
-  static_assert(sizeof(T) == sizeof(uint64_t));
+  static_assert(sizeof(T) == sizeof(uint64_t), "next_tape_value() template parameter must be 64-bit");
   // Though the following is tempting...
   //  return *reinterpret_cast<const T*>(&doc->tape[json_index + 1]);
   // It is not generally safe. It is safer, and often faster to rely
@@ -1192,7 +1189,7 @@ inline std::string_view internal::tape_ref::get_string_view() const noexcept {
   );
 }
 
-
-} // namespace simdjson::internal
+} // namespace internal
+} // namespace simdjson
 
 #endif // SIMDJSON_INLINE_DOCUMENT_H
diff --git a/include/simdjson/inline/document_stream.h b/include/simdjson/inline/document_stream.h
index 93cf5122..8bd75dbe 100644
--- a/include/simdjson/inline/document_stream.h
+++ b/include/simdjson/inline/document_stream.h
@@ -7,7 +7,8 @@
 #include <stdexcept>
 #include <thread>
 
-namespace simdjson::internal {
+namespace simdjson {
+namespace internal {
 
 /**
  * This algorithm is used to quickly identify the buffer position of
@@ -93,9 +94,12 @@ static inline size_t trimmed_length_safe_utf8(const char * c, size_t len) {
   return len;
 }
 
-} // namespace simdjson::internal
+} // namespace internal
 
-namespace simdjson::dom {
+} // namespace simdjson
+
+namespace simdjson {
+namespace dom {
 
 really_inline document_stream::document_stream(
   dom::parser &_parser,
@@ -272,5 +276,6 @@ inline error_code document_stream::json_parse() noexcept {
 }
 #endif // SIMDJSON_THREADS_ENABLED
 
-} // namespace simdjson::dom
+} // namespace dom
+} // namespace simdjson
 #endif // SIMDJSON_INLINE_DOCUMENT_STREAM_H
diff --git a/include/simdjson/inline/error.h b/include/simdjson/inline/error.h
index 5cece7a7..8f961ca1 100644
--- a/include/simdjson/inline/error.h
+++ b/include/simdjson/inline/error.h
@@ -4,7 +4,8 @@
 #include "simdjson/error.h"
 #include <string>
 
-namespace simdjson::internal {
+namespace simdjson {
+namespace internal {
   // We store the error code so we can validate the error message is associated with the right code
   struct error_code_info {
     error_code code;
@@ -12,9 +13,8 @@ namespace simdjson::internal {
   };
   // These MUST match the codes in error_code. We check this constraint in basictests.
   extern SIMDJSON_DLLIMPORTEXPORT const error_code_info error_codes[];
-} // namespace simdjson::internal
+} // namespace internal
 
-namespace simdjson {
 
 inline const char *error_message(error_code error) noexcept {
   // If you're using error_code, we're trusting you got it from the enum.
diff --git a/include/simdjson/inline/padded_string.h b/include/simdjson/inline/padded_string.h
index 8caed20a..748e2c47 100644
--- a/include/simdjson/inline/padded_string.h
+++ b/include/simdjson/inline/padded_string.h
@@ -9,7 +9,8 @@
 #include <memory>
 #include <string>
 
-namespace simdjson::internal {
+namespace simdjson {
+namespace internal {
 
 // low-level function to allocate memory with padding so we can read past the
 // "length" bytes safely. if you must provide a pointer to some data, create it
@@ -30,9 +31,8 @@ inline char *allocate_padded_buffer(size_t length) noexcept {
   return padded_buffer;
 } // allocate_padded_buffer()
 
-} // namespace simdjson::internal
+} // namespace internal
 
-namespace simdjson {
 
 inline padded_string::padded_string() noexcept : viable_size(0), data_ptr(nullptr) {}
 inline padded_string::padded_string(size_t length) noexcept
diff --git a/include/simdjson/internal/jsonformatutils.h b/include/simdjson/internal/jsonformatutils.h
index f4c585a0..4c16eaab 100644
--- a/include/simdjson/internal/jsonformatutils.h
+++ b/include/simdjson/internal/jsonformatutils.h
@@ -5,7 +5,8 @@
 #include <iostream>
 #include <sstream>
 
-namespace simdjson::internal {
+namespace simdjson {
+namespace internal {
 
 class escape_json_string;
 
@@ -58,6 +59,7 @@ inline std::ostream& operator<<(std::ostream& out, const escape_json_string &une
   return out;
 }
 
-} // namespace simdjson::internal
+} // namespace internal
+} // namespace simdjson
 
 #endif // SIMDJSON_INTERNAL_JSONFORMATUTILS_H
diff --git a/include/simdjson/padded_string.h b/include/simdjson/padded_string.h
index 5f1954ad..2f60131f 100644
--- a/include/simdjson/padded_string.h
+++ b/include/simdjson/padded_string.h
@@ -127,7 +127,8 @@ inline simdjson::padded_string operator "" _padded(const char *str, size_t len)
   return simdjson::padded_string(str, len);
 }
 
-namespace simdjson::internal {
+namespace simdjson {
+namespace internal {
 
 // low-level function to allocate memory with padding so we can read past the
 // "length" bytes safely. if you must provide a pointer to some data, create it
@@ -135,6 +136,7 @@ namespace simdjson::internal {
 // responsible to free the memory (free(...))
 inline char *allocate_padded_buffer(size_t length) noexcept;
 
-} // namespace simdjson::internal;
+} // namespace internal
+} // namespace simdjson
 
 #endif // SIMDJSON_PADDED_STRING_H
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index f16f2fc9..8148388f 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -6,7 +6,8 @@
 #
 add_library(simdjson-include-source INTERFACE)
 target_link_libraries(simdjson-include-source INTERFACE simdjson-headers)
-target_include_directories(simdjson-include-source INTERFACE .)
+target_include_directories(simdjson-include-source INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
+export_private_library(simdjson-include-source)
 
 #
 # For callers who intend to compile simdjson.cpp themselves.
@@ -15,8 +16,9 @@ target_include_directories(simdjson-include-source INTERFACE .)
 # the .cpp sources. It does not specify any compiler flags.
 #
 add_library(simdjson-source INTERFACE)
-target_sources(simdjson-source INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/simdjson.cpp)
+target_sources(simdjson-source INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>/simdjson.cpp)
 target_link_libraries(simdjson-source INTERFACE simdjson-include-source)
+export_private_library(simdjson-source)
 
 #
 # simdjson is the distributed library compiled with flags.
@@ -39,9 +41,11 @@ else()
   endif()
 endif()
 
-target_link_libraries(simdjson PRIVATE simdjson-source simdjson-flags)
 target_link_libraries(simdjson INTERFACE simdjson-headers) # Only expose the headers, not sources
 
+target_link_libraries(simdjson PRIVATE simdjson-source simdjson-flags)
+
+
 if(NOT MSVC)
   ## We output the library at the root of the current directory where cmake is invoked
   ## This is handy but Visual Studio will happily ignore us
diff --git a/src/arm64/bitmanipulation.h b/src/arm64/bitmanipulation.h
index d0616065..4c55ef5f 100644
--- a/src/arm64/bitmanipulation.h
+++ b/src/arm64/bitmanipulation.h
@@ -4,28 +4,24 @@
 #include "simdjson.h"
 #include "arm64/intrinsics.h"
 
-namespace simdjson::arm64 {
+namespace simdjson {
+namespace arm64 {
 
-#ifndef _MSC_VER
+NO_SANITIZE_UNDEFINED
 // We sometimes call trailing_zero on inputs that are zero,
 // but the algorithms do not end up using the returned value.
-// Sadly, sanitizers are not smart enough to figure it out. 
-__attribute__((no_sanitize("undefined"))) // this is deliberate
-#endif // _MSC_VER
-/* result might be undefined when input_num is zero */
+// Sadly, sanitizers are not smart enough to figure it out.
 really_inline int trailing_zeroes(uint64_t input_num) {
-
 #ifdef _MSC_VER
   unsigned long ret;
   // Search the mask data from least significant bit (LSB) 
   // to the most significant bit (MSB) for a set bit (1).
   _BitScanForward64(&ret, input_num);
   return (int)ret;
-#else
+#else // _MSC_VER
   return __builtin_ctzll(input_num);
 #endif // _MSC_VER
-
-} // namespace simdjson::arm64
+}
 
 /* result might be undefined when input_num is zero */
 really_inline uint64_t clear_lowest_bit(uint64_t input_num) {
@@ -78,6 +74,7 @@ really_inline bool mul_overflow(uint64_t value1, uint64_t value2, uint64_t *resu
 #endif
 }
 
-} // namespace simdjson::arm64
+} // namespace arm64
+} // namespace simdjson
 
 #endif // SIMDJSON_ARM64_BITMANIPULATION_H
diff --git a/src/arm64/bitmask.h b/src/arm64/bitmask.h
index 11f39a4d..3c8ceed9 100644
--- a/src/arm64/bitmask.h
+++ b/src/arm64/bitmask.h
@@ -5,7 +5,8 @@
 
 #include "arm64/intrinsics.h"
 
-namespace simdjson::arm64 {
+namespace simdjson {
+namespace arm64 {
 
 //
 // Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
@@ -35,7 +36,8 @@ really_inline uint64_t prefix_xor(uint64_t bitmask) {
   return bitmask;
 }
 
-} // namespace simdjson::arm64
+} // namespace arm64
+} // namespace simdjson
 UNTARGET_REGION
 
 #endif
diff --git a/src/arm64/implementation.h b/src/arm64/implementation.h
index 29d42d29..e8da3354 100644
--- a/src/arm64/implementation.h
+++ b/src/arm64/implementation.h
@@ -4,7 +4,8 @@
 #include "simdjson.h"
 #include "isadetection.h"
 
-namespace simdjson::arm64 {
+namespace simdjson {
+namespace arm64 {
 
 using namespace simdjson::dom;
 
@@ -18,6 +19,7 @@ public:
   WARN_UNUSED error_code stage2(const uint8_t *buf, size_t len, parser &parser, size_t &next_json) const noexcept final;
 };
 
-} // namespace simdjson::arm64
+} // namespace arm64
+} // namespace simdjson
 
 #endif // SIMDJSON_ARM64_IMPLEMENTATION_H
diff --git a/src/arm64/numberparsing.h b/src/arm64/numberparsing.h
index 03523a42..b00263f0 100644
--- a/src/arm64/numberparsing.h
+++ b/src/arm64/numberparsing.h
@@ -16,7 +16,8 @@ void found_unsigned_integer(uint64_t result, const uint8_t *buf);
 void found_float(double result, const uint8_t *buf);
 #endif
 
-namespace simdjson::arm64 {
+namespace simdjson {
+namespace arm64 {
 
 // we don't have SSE, so let us use a scalar function
 // credit: https://johnnylee-sde.github.io/Fast-numeric-string-to-int/
@@ -32,6 +33,7 @@ static inline uint32_t parse_eight_digits_unrolled(const char *chars) {
 
 #include "generic/numberparsing.h"
 
-} // namespace simdjson::arm64
+} // namespace arm64
+} // namespace simdjson
 
 #endif // SIMDJSON_ARM64_NUMBERPARSING_H
diff --git a/src/arm64/simd.h b/src/arm64/simd.h
index 404db870..4e02aa9c 100644
--- a/src/arm64/simd.h
+++ b/src/arm64/simd.h
@@ -6,7 +6,9 @@
 #include "arm64/bitmanipulation.h"
 #include "arm64/intrinsics.h"
 
-namespace simdjson::arm64::simd {
+namespace simdjson {
+namespace arm64 {
+namespace simd {
 
   template<typename T>
   struct simd8;
@@ -387,6 +389,8 @@ namespace simdjson::arm64::simd {
     }
   }; // struct simd8x64<T>
 
-} // namespace simdjson::arm64::simd
+} // namespace simd
+} // namespace arm64
+} // namespace simdjson
 
 #endif // SIMDJSON_ARM64_SIMD_H
diff --git a/src/arm64/stage1_find_marks.h b/src/arm64/stage1_find_marks.h
index da61fb95..18bb3951 100644
--- a/src/arm64/stage1_find_marks.h
+++ b/src/arm64/stage1_find_marks.h
@@ -7,7 +7,8 @@
 #include "arm64/bitmanipulation.h"
 #include "arm64/implementation.h"
 
-namespace simdjson::arm64 {
+namespace simdjson {
+namespace arm64 {
 
 using namespace simd;
 
@@ -85,6 +86,7 @@ WARN_UNUSED error_code implementation::stage1(const uint8_t *buf, size_t len, pa
   return arm64::stage1::json_structural_indexer::index<64>(buf, len, parser, streaming);
 }
 
-} // namespace simdjson::arm64
+} // namespace arm64
+} // namespace simdjson
 
 #endif // SIMDJSON_ARM64_STAGE1_FIND_MARKS_H
diff --git a/src/arm64/stage2_build_tape.h b/src/arm64/stage2_build_tape.h
index 2b711157..58804c56 100644
--- a/src/arm64/stage2_build_tape.h
+++ b/src/arm64/stage2_build_tape.h
@@ -6,12 +6,14 @@
 #include "arm64/stringparsing.h"
 #include "arm64/numberparsing.h"
 
-namespace simdjson::arm64 {
+namespace simdjson {
+namespace arm64 {
 
 #include "generic/atomparsing.h"
 #include "generic/stage2_build_tape.h"
 #include "generic/stage2_streaming_build_tape.h"
 
-} // namespace simdjson::arm64
+} // namespace arm64
+} // namespace simdjson
 
 #endif // SIMDJSON_ARM64_STAGE2_BUILD_TAPE_H
diff --git a/src/arm64/stringparsing.h b/src/arm64/stringparsing.h
index 7dd9db68..2069dcff 100644
--- a/src/arm64/stringparsing.h
+++ b/src/arm64/stringparsing.h
@@ -7,7 +7,8 @@
 #include "arm64/intrinsics.h"
 #include "arm64/bitmanipulation.h"
 
-namespace simdjson::arm64 {
+namespace simdjson {
+namespace arm64 {
 
 using namespace simd;
 
@@ -29,7 +30,7 @@ public:
 really_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
   // this can read up to 31 bytes beyond the buffer size, but we require
   // SIMDJSON_PADDING of padding
-  static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1));
+  static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
   simd8<uint8_t> v0(src);
   simd8<uint8_t> v1(src + sizeof(v0));
   v0.store(dst);
@@ -46,7 +47,7 @@ really_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8
 
 #include "generic/stringparsing.h"
 
-}
-// namespace simdjson::amd64
+} // namespace arm64
+} // namespace simdjson
 
 #endif // SIMDJSON_ARM64_STRINGPARSING_H
diff --git a/src/document_parser_callbacks.h b/src/document_parser_callbacks.h
index 5a54a45f..c2b4b63b 100644
--- a/src/document_parser_callbacks.h
+++ b/src/document_parser_callbacks.h
@@ -3,7 +3,8 @@
 
 #include "simdjson.h"
 
-namespace simdjson::dom {
+namespace simdjson {
+namespace dom {
 
 //
 // Parser callbacks
@@ -138,6 +139,7 @@ really_inline void parser::end_scope(uint32_t depth) noexcept {
   doc.tape[d.tape_index] |= current_loc | (static_cast<uint64_t>(cntsat) << 32);
 }
 
-} // namespace simdjson::dom
+} // namespace simdjson
+} // namespace dom
 
 #endif // SIMDJSON_DOCUMENT_PARSER_CALLBACKS_H
diff --git a/src/error.cpp b/src/error.cpp
index 0fbbff8a..3e9701ca 100644
--- a/src/error.cpp
+++ b/src/error.cpp
@@ -1,6 +1,8 @@
 #include "simdjson/error.h"
 
-namespace simdjson::internal {
+namespace simdjson {
+namespace internal {
+
   SIMDJSON_DLLIMPORTEXPORT const error_code_info error_codes[] {
     { SUCCESS, "No error" },
     { SUCCESS_AND_HAS_MORE, "No error and buffer still has more data" },
@@ -28,4 +30,6 @@ namespace simdjson::internal {
     { INVALID_URI_FRAGMENT, "Invalid URI fragment syntax." },
     { UNEXPECTED_ERROR, "Unexpected error, consider reporting this problem as you may have found a bug in simdjson" }
   }; // error_messages[]
-}
\ No newline at end of file
+
+} // namespace internal
+} // namespace simdjson
\ No newline at end of file
diff --git a/src/fallback/bitmanipulation.h b/src/fallback/bitmanipulation.h
index 6d00c80c..96a557fa 100644
--- a/src/fallback/bitmanipulation.h
+++ b/src/fallback/bitmanipulation.h
@@ -4,28 +4,24 @@
 #include "simdjson.h"
 #include <limits>
 
-namespace simdjson::fallback {
+namespace simdjson {
+namespace fallback {
 
-#ifndef _MSC_VER
 // We sometimes call trailing_zero on inputs that are zero,
 // but the algorithms do not end up using the returned value.
-// Sadly, sanitizers are not smart enough to figure it out. 
-__attribute__((no_sanitize("undefined"))) // this is deliberate
-#endif // _MSC_VER
-/* result might be undefined when input_num is zero */
+// Sadly, sanitizers are not smart enough to figure it out.
+NO_SANITIZE_UNDEFINED
 really_inline int trailing_zeroes(uint64_t input_num) {
-
 #ifdef _MSC_VER
   unsigned long ret;
   // Search the mask data from least significant bit (LSB) 
   // to the most significant bit (MSB) for a set bit (1).
   _BitScanForward64(&ret, input_num);
   return (int)ret;
-#else
+#else // _MSC_VER
   return __builtin_ctzll(input_num);
 #endif // _MSC_VER
-
-} // namespace simdjson::arm64
+}
 
 /* result might be undefined when input_num is zero */
 really_inline uint64_t clear_lowest_bit(uint64_t input_num) {
@@ -58,6 +54,7 @@ really_inline bool mul_overflow(uint64_t value1, uint64_t value2, uint64_t *resu
   return value2 > 0 && value1 > std::numeric_limits<uint64_t>::max() / value2;
 }
 
-} // namespace simdjson::fallback
+} // namespace fallback
+} // namespace simdjson
 
 #endif // SIMDJSON_FALLBACK_BITMANIPULATION_H
diff --git a/src/fallback/implementation.h b/src/fallback/implementation.h
index b184120a..90372b00 100644
--- a/src/fallback/implementation.h
+++ b/src/fallback/implementation.h
@@ -4,7 +4,8 @@
 #include "simdjson.h"
 #include "isadetection.h"
 
-namespace simdjson::fallback {
+namespace simdjson {
+namespace fallback {
 
 using namespace simdjson::dom;
 
@@ -22,6 +23,8 @@ public:
   WARN_UNUSED error_code stage2(const uint8_t *buf, size_t len, parser &parser, size_t &next_json) const noexcept final;
 };
 
-} // namespace simdjson::fallback
+} // namespace fallback
+
+} // namespace simdjson
 
 #endif // SIMDJSON_FALLBACK_IMPLEMENTATION_H
\ No newline at end of file
diff --git a/src/fallback/numberparsing.h b/src/fallback/numberparsing.h
index b32e4f05..31d6c95d 100644
--- a/src/fallback/numberparsing.h
+++ b/src/fallback/numberparsing.h
@@ -14,7 +14,8 @@ void found_unsigned_integer(uint64_t result, const uint8_t *buf);
 void found_float(double result, const uint8_t *buf);
 #endif
 
-namespace simdjson::fallback {
+namespace simdjson {
+namespace fallback {
 static inline uint32_t parse_eight_digits_unrolled(const char *chars) {
   uint32_t result = 0;
   for (int i=0;i<8;i++) {
@@ -27,6 +28,8 @@ static inline uint32_t parse_eight_digits_unrolled(const char *chars) {
 
 #include "generic/numberparsing.h"
 
-} // namespace simdjson::fallback
+} // namespace fallback
+
+} // namespace simdjson
 
 #endif // SIMDJSON_FALLBACK_NUMBERPARSING_H
diff --git a/src/fallback/stage1_find_marks.h b/src/fallback/stage1_find_marks.h
index d04e4ed5..eaffeba0 100644
--- a/src/fallback/stage1_find_marks.h
+++ b/src/fallback/stage1_find_marks.h
@@ -4,7 +4,9 @@
 #include "simdjson.h"
 #include "fallback/implementation.h"
 
-namespace simdjson::fallback::stage1 {
+namespace simdjson {
+namespace fallback {
+namespace stage1 {
 
 class structural_scanner {
 public:
@@ -139,9 +141,8 @@ private:
   bool streaming;
 }; // structural_scanner
 
-} // simdjson::fallback::stage1
+} // namespace stage1
 
-namespace simdjson::fallback {
 
 WARN_UNUSED error_code implementation::stage1(const uint8_t *buf, size_t len, parser &parser, bool streaming) const noexcept {
   if (unlikely(len > parser.capacity())) {
@@ -207,6 +208,7 @@ WARN_UNUSED error_code implementation::minify(const uint8_t *buf, size_t len, ui
   return SUCCESS;
 }
 
-} // namespace simdjson::fallback
+} // namespace fallback
+} // namespace simdjson
 
 #endif // SIMDJSON_FALLBACK_STAGE1_FIND_MARKS_H
diff --git a/src/fallback/stage2_build_tape.h b/src/fallback/stage2_build_tape.h
index 41b0c82b..0baed8e1 100644
--- a/src/fallback/stage2_build_tape.h
+++ b/src/fallback/stage2_build_tape.h
@@ -7,12 +7,14 @@
 #include "fallback/stringparsing.h"
 #include "fallback/numberparsing.h"
 
-namespace simdjson::fallback {
+namespace simdjson {
+namespace fallback {
 
 #include "generic/atomparsing.h"
 #include "generic/stage2_build_tape.h"
 #include "generic/stage2_streaming_build_tape.h"
 
+} // namespace fallback
 } // namespace simdjson
 
 #endif // SIMDJSON_FALLBACK_STAGE2_BUILD_TAPE_H
diff --git a/src/fallback/stringparsing.h b/src/fallback/stringparsing.h
index ac986a79..c3375afe 100644
--- a/src/fallback/stringparsing.h
+++ b/src/fallback/stringparsing.h
@@ -4,7 +4,8 @@
 #include "simdjson.h"
 #include "jsoncharutils.h"
 
-namespace simdjson::fallback {
+namespace simdjson {
+namespace fallback {
 
 // Holds backslashes and quotes locations.
 struct backslash_and_quote {
@@ -28,6 +29,7 @@ really_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8
 
 #include "generic/stringparsing.h"
 
-} // namespace simdjson::fallback
+} // namespace fallback
+} // namespace simdjson
 
 #endif // SIMDJSON_FALLBACK_STRINGPARSING_H
diff --git a/src/generic/atomparsing.h b/src/generic/atomparsing.h
index 142bef5e..12cfdbbf 100644
--- a/src/generic/atomparsing.h
+++ b/src/generic/atomparsing.h
@@ -5,7 +5,7 @@ really_inline uint32_t string_to_uint32(const char* str) { return *reinterpret_c
 WARN_UNUSED
 really_inline bool str4ncmp(const uint8_t *src, const char* atom) {
   uint32_t srcval; // we want to avoid unaligned 64-bit loads (undefined in C/C++)
-  static_assert(sizeof(uint32_t) <= SIMDJSON_PADDING);
+  static_assert(sizeof(uint32_t) <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be larger than 4 bytes");
   std::memcpy(&srcval, src, sizeof(uint32_t));
   return srcval ^ string_to_uint32(atom);
 }
diff --git a/src/generic/numberparsing.h b/src/generic/numberparsing.h
index d0d9196f..bea1de10 100644
--- a/src/generic/numberparsing.h
+++ b/src/generic/numberparsing.h
@@ -242,7 +242,7 @@ really_inline bool is_made_of_eight_digits_fast(const char *chars) {
   uint64_t val;
   // this can read up to 7 bytes beyond the buffer size, but we require
   // SIMDJSON_PADDING of padding
-  static_assert(7 <= SIMDJSON_PADDING);
+  static_assert(7 <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be bigger than 7");
   memcpy(&val, chars, 8);
   // a branchy method might be faster:
   // return (( val & 0xF0F0F0F0F0F0F0F0 ) == 0x3030303030303030)
diff --git a/src/haswell/bitmanipulation.h b/src/haswell/bitmanipulation.h
index c46f0733..37385a9b 100644
--- a/src/haswell/bitmanipulation.h
+++ b/src/haswell/bitmanipulation.h
@@ -6,25 +6,24 @@
 #include "haswell/intrinsics.h"
 
 TARGET_HASWELL
-namespace simdjson::haswell {
+namespace simdjson {
+namespace haswell {
 
-#ifndef _MSC_VER
 // We sometimes call trailing_zero on inputs that are zero,
 // but the algorithms do not end up using the returned value.
 // Sadly, sanitizers are not smart enough to figure it out.
-__attribute__((no_sanitize("undefined")))  // this is deliberate
-#endif
+NO_SANITIZE_UNDEFINED
 really_inline int trailing_zeroes(uint64_t input_num) {
 #ifdef _MSC_VER
   return (int)_tzcnt_u64(input_num);
-#else
+#else // _MSC_VER
   ////////
   // You might expect the next line to be equivalent to 
   // return (int)_tzcnt_u64(input_num);
   // but the generated code differs and might be less efficient?
   ////////
   return __builtin_ctzll(input_num);
-#endif// _MSC_VER
+#endif // _MSC_VER
 }
 
 /* result might be undefined when input_num is zero */
@@ -71,7 +70,9 @@ really_inline bool mul_overflow(uint64_t value1, uint64_t value2,
                                    (unsigned long long *)result);
 #endif
 }
-}// namespace simdjson::haswell
+
+} // namespace haswell
+} // namespace simdjson
 UNTARGET_REGION
 
 #endif // SIMDJSON_HASWELL_BITMANIPULATION_H
diff --git a/src/haswell/bitmask.h b/src/haswell/bitmask.h
index f97272e6..c9ed2e0e 100644
--- a/src/haswell/bitmask.h
+++ b/src/haswell/bitmask.h
@@ -6,7 +6,8 @@
 #include "haswell/intrinsics.h"
 
 TARGET_HASWELL
-namespace simdjson::haswell {
+namespace simdjson {
+namespace haswell {
 
 //
 // Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
@@ -21,7 +22,9 @@ really_inline uint64_t prefix_xor(const uint64_t bitmask) {
   return _mm_cvtsi128_si64(result);
 }
 
-} // namespace simdjson::haswell
+} // namespace haswell
+
+} // namespace simdjson
 UNTARGET_REGION
 
 #endif // SIMDJSON_HASWELL_BITMASK_H
diff --git a/src/haswell/implementation.h b/src/haswell/implementation.h
index fa2bda69..12024ec2 100644
--- a/src/haswell/implementation.h
+++ b/src/haswell/implementation.h
@@ -4,7 +4,8 @@
 #include "simdjson.h"
 #include "isadetection.h"
 
-namespace simdjson::haswell {
+namespace simdjson {
+namespace haswell {
 
 using namespace simdjson::dom;
 
@@ -22,6 +23,7 @@ public:
   WARN_UNUSED error_code stage2(const uint8_t *buf, size_t len, parser &parser, size_t &next_json) const noexcept final;
 };
 
-} // namespace simdjson::haswell
+} // namespace haswell
+} // namespace simdjson
 
 #endif // SIMDJSON_HASWELL_IMPLEMENTATION_H
\ No newline at end of file
diff --git a/src/haswell/numberparsing.h b/src/haswell/numberparsing.h
index 41ad4246..e4c7820e 100644
--- a/src/haswell/numberparsing.h
+++ b/src/haswell/numberparsing.h
@@ -17,7 +17,8 @@ void found_float(double result, const uint8_t *buf);
 #endif
 
 TARGET_HASWELL
-namespace simdjson::haswell {
+namespace simdjson {
+namespace haswell {
 static inline uint32_t parse_eight_digits_unrolled(const char *chars) {
   // this actually computes *16* values so we are being wasteful.
   const __m128i ascii0 = _mm_set1_epi8('0');
@@ -40,7 +41,9 @@ static inline uint32_t parse_eight_digits_unrolled(const char *chars) {
 
 #include "generic/numberparsing.h"
 
-} // namespace simdjson::haswell
+} // namespace haswell
+
+} // namespace simdjson
 UNTARGET_REGION
 
 #endif // SIMDJSON_HASWELL_NUMBERPARSING_H
diff --git a/src/haswell/simd.h b/src/haswell/simd.h
index 2fb9f12c..56acae1c 100644
--- a/src/haswell/simd.h
+++ b/src/haswell/simd.h
@@ -7,7 +7,9 @@
 #include "haswell/intrinsics.h"
 
 TARGET_HASWELL
-namespace simdjson::haswell::simd {
+namespace simdjson {
+namespace haswell {
+namespace simd {
 
   // Forward-declared so they can be used by splat and friends.
   template<typename Child>
@@ -366,7 +368,10 @@ namespace simdjson::haswell::simd {
     }
   }; // struct simd8x64<T>
 
-} // namespace simdjson::haswell::simd
+} // namespace simd
+
+} // namespace haswell
+} // namespace simdjson
 UNTARGET_REGION
 
 #endif // SIMDJSON_HASWELL_SIMD_H
diff --git a/src/haswell/stage1_find_marks.h b/src/haswell/stage1_find_marks.h
index f2f08cb3..16f9f9f1 100644
--- a/src/haswell/stage1_find_marks.h
+++ b/src/haswell/stage1_find_marks.h
@@ -9,7 +9,8 @@
 #include "haswell/implementation.h"
 
 TARGET_HASWELL
-namespace simdjson::haswell {
+namespace simdjson {
+namespace haswell {
 
 using namespace simd;
 
@@ -74,7 +75,9 @@ WARN_UNUSED error_code implementation::stage1(const uint8_t *buf, size_t len, pa
   return haswell::stage1::json_structural_indexer::index<128>(buf, len, parser, streaming);
 }
 
-} // namespace simdjson::haswell
+} // namespace haswell
+
+} // namespace simdjson
 UNTARGET_REGION
 
 #endif // SIMDJSON_HASWELL_STAGE1_FIND_MARKS_H
diff --git a/src/haswell/stage2_build_tape.h b/src/haswell/stage2_build_tape.h
index 34560779..9eeedbf8 100644
--- a/src/haswell/stage2_build_tape.h
+++ b/src/haswell/stage2_build_tape.h
@@ -7,12 +7,14 @@
 #include "haswell/numberparsing.h"
 
 TARGET_HASWELL
-namespace simdjson::haswell {
+namespace simdjson {
+namespace haswell {
 
 #include "generic/atomparsing.h"
 #include "generic/stage2_build_tape.h"
 #include "generic/stage2_streaming_build_tape.h"
 
+} // namespace haswell
 } // namespace simdjson
 UNTARGET_REGION
 
diff --git a/src/haswell/stringparsing.h b/src/haswell/stringparsing.h
index 6e6a633c..67de0ec8 100644
--- a/src/haswell/stringparsing.h
+++ b/src/haswell/stringparsing.h
@@ -8,7 +8,8 @@
 #include "haswell/bitmanipulation.h"
 
 TARGET_HASWELL
-namespace simdjson::haswell {
+namespace simdjson {
+namespace haswell {
 
 using namespace simd;
 
@@ -30,7 +31,7 @@ public:
 really_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
   // this can read up to 15 bytes beyond the buffer size, but we require
   // SIMDJSON_PADDING of padding
-  static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1));
+  static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
   simd8<uint8_t> v(src);
   // store to dest unconditionally - we can overwrite the bits we don't like later
   v.store(dst);
@@ -42,7 +43,8 @@ really_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8
 
 #include "generic/stringparsing.h"
 
-} // namespace simdjson::haswell
+} // namespace haswell
+} // namespace simdjson
 UNTARGET_REGION
 
 #endif // SIMDJSON_HASWELL_STRINGPARSING_H
diff --git a/src/implementation.cpp b/src/implementation.cpp
index 0c0a51b3..c33111a3 100644
--- a/src/implementation.cpp
+++ b/src/implementation.cpp
@@ -9,25 +9,26 @@
 
 #if SIMDJSON_IMPLEMENTATION_HASWELL
 #include "haswell/implementation.h"
-namespace simdjson::internal { const haswell::implementation haswell_singleton{}; }
+namespace simdjson { namespace internal { const haswell::implementation haswell_singleton{}; } }
 #endif // SIMDJSON_IMPLEMENTATION_HASWELL
 
 #if SIMDJSON_IMPLEMENTATION_WESTMERE
 #include "westmere/implementation.h"
-namespace simdjson::internal { const westmere::implementation westmere_singleton{}; }
+namespace simdjson { namespace internal { const westmere::implementation westmere_singleton{}; } }
 #endif // SIMDJSON_IMPLEMENTATION_WESTMERE
 
 #if SIMDJSON_IMPLEMENTATION_ARM64
 #include "arm64/implementation.h"
-namespace simdjson::internal { const arm64::implementation arm64_singleton{}; }
+namespace simdjson { namespace internal { const arm64::implementation arm64_singleton{}; } }
 #endif // SIMDJSON_IMPLEMENTATION_ARM64
 
 #if SIMDJSON_IMPLEMENTATION_FALLBACK
 #include "fallback/implementation.h"
-namespace simdjson::internal { const fallback::implementation fallback_singleton{}; }
+namespace simdjson { namespace internal { const fallback::implementation fallback_singleton{}; } }
 #endif // SIMDJSON_IMPLEMENTATION_FALLBACK
 
-namespace simdjson::internal {
+namespace simdjson {
+namespace internal {
 
 /**
  * @private Detects best supported implementation on first use, and sets it
@@ -124,9 +125,9 @@ const implementation *detect_best_supported_implementation_on_first_use::set_bes
   return active_implementation = available_implementations.detect_best_supported();
 }
 
-} // namespace simdjson::internal
+} // namespace internal
 
-namespace simdjson {
-  SIMDJSON_DLLIMPORTEXPORT const internal::available_implementation_list available_implementations{};
-  SIMDJSON_DLLIMPORTEXPORT internal::atomic_ptr<const implementation> active_implementation{&internal::detect_best_supported_implementation_on_first_use_singleton};
-}
+SIMDJSON_DLLIMPORTEXPORT const internal::available_implementation_list available_implementations{};
+SIMDJSON_DLLIMPORTEXPORT internal::atomic_ptr<const implementation> active_implementation{&internal::detect_best_supported_implementation_on_first_use_singleton};
+
+} // namespace simdjson
diff --git a/src/isadetection.h b/src/isadetection.h
index 84ab6ffa..8da459c8 100644
--- a/src/isadetection.h
+++ b/src/isadetection.h
@@ -148,6 +148,6 @@ static inline uint32_t detect_supported_architectures() {
 
 #endif // end SIMD extension detection code
 
-} // namespace simdjson::internal
+} // namespace simdjson
 
 #endif // SIMDJSON_ISADETECTION_H
diff --git a/src/westmere/bitmanipulation.h b/src/westmere/bitmanipulation.h
index da1b8256..5ebf65ec 100644
--- a/src/westmere/bitmanipulation.h
+++ b/src/westmere/bitmanipulation.h
@@ -5,15 +5,13 @@
 #include "westmere/intrinsics.h"
 
 TARGET_WESTMERE
-namespace simdjson::westmere {
+namespace simdjson {
+namespace westmere {
 
-#ifndef _MSC_VER
 // We sometimes call trailing_zero on inputs that are zero,
 // but the algorithms do not end up using the returned value.
-// Sadly, sanitizers are not smart enough to figure it out.
-__attribute__((no_sanitize("undefined")))  // this is deliberate
-#endif
-/* result might be undefined when input_num is zero */
+// Sadly, sanitizers are not smart enough to figure it out. 
+NO_SANITIZE_UNDEFINED
 really_inline int trailing_zeroes(uint64_t input_num) {
 #ifdef _MSC_VER
   unsigned long ret;
@@ -21,9 +19,9 @@ really_inline int trailing_zeroes(uint64_t input_num) {
   // to the most significant bit (MSB) for a set bit (1).
   _BitScanForward64(&ret, input_num);
   return (int)ret;
-#else
+#else // _MSC_VER
   return __builtin_ctzll(input_num);
-#endif// _MSC_VER
+#endif // _MSC_VER
 }
 
 /* result might be undefined when input_num is zero */
@@ -81,7 +79,9 @@ really_inline bool mul_overflow(uint64_t value1, uint64_t value2,
 #endif
 }
 
-} // namespace simdjson::westmere
+} // namespace westmere
+
+} // namespace simdjson
 UNTARGET_REGION
 
 #endif // SIMDJSON_WESTMERE_BITMANIPULATION_H
diff --git a/src/westmere/bitmask.h b/src/westmere/bitmask.h
index 58eacca3..32bab6da 100644
--- a/src/westmere/bitmask.h
+++ b/src/westmere/bitmask.h
@@ -5,7 +5,8 @@
 #include "westmere/intrinsics.h"
 
 TARGET_WESTMERE
-namespace simdjson::westmere {
+namespace simdjson {
+namespace westmere {
 
 //
 // Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
@@ -20,7 +21,9 @@ really_inline uint64_t prefix_xor(const uint64_t bitmask) {
   return _mm_cvtsi128_si64(result);
 }
 
-} // namespace simdjson::westmere
+} // namespace westmere
+
+} // namespace simdjson
 UNTARGET_REGION
 
 #endif // SIMDJSON_WESTMERE_BITMASK_H
diff --git a/src/westmere/implementation.h b/src/westmere/implementation.h
index 478782f3..ad4bb599 100644
--- a/src/westmere/implementation.h
+++ b/src/westmere/implementation.h
@@ -5,7 +5,8 @@
 #include "simdjson/implementation.h"
 #include "isadetection.h"
 
-namespace simdjson::westmere {
+namespace simdjson {
+namespace westmere {
 
 using namespace simdjson::dom;
 
@@ -19,6 +20,7 @@ public:
   WARN_UNUSED error_code stage2(const uint8_t *buf, size_t len, parser &parser, size_t &next_json) const noexcept final;
 };
 
-} // namespace simdjson::westmere
+} // namespace westmere
+} // namespace simdjson
 
 #endif // SIMDJSON_WESTMERE_IMPLEMENTATION_H
\ No newline at end of file
diff --git a/src/westmere/numberparsing.h b/src/westmere/numberparsing.h
index cf039498..27f8a773 100644
--- a/src/westmere/numberparsing.h
+++ b/src/westmere/numberparsing.h
@@ -18,7 +18,8 @@ void found_float(double result, const uint8_t *buf);
 
 
 TARGET_WESTMERE
-namespace simdjson::westmere {
+namespace simdjson {
+namespace westmere {
 static inline uint32_t parse_eight_digits_unrolled(const char *chars) {
   // this actually computes *16* values so we are being wasteful.
   const __m128i ascii0 = _mm_set1_epi8('0');
@@ -41,7 +42,9 @@ static inline uint32_t parse_eight_digits_unrolled(const char *chars) {
 
 #include "generic/numberparsing.h"
 
-} // namespace simdjson::westmere
+} // namespace westmere
+
+} // namespace simdjson
 UNTARGET_REGION
 
 #endif //  SIMDJSON_WESTMERE_NUMBERPARSING_H
diff --git a/src/westmere/simd.h b/src/westmere/simd.h
index 3ed56f17..75b2d03f 100644
--- a/src/westmere/simd.h
+++ b/src/westmere/simd.h
@@ -9,7 +9,9 @@
 
 
 TARGET_WESTMERE
-namespace simdjson::westmere::simd {
+namespace simdjson {
+namespace westmere {
+namespace simd {
 
   template<typename Child>
   struct base {
@@ -351,7 +353,10 @@ namespace simdjson::westmere::simd {
     }
   }; // struct simd8x64<T>
 
-} // namespace simdjson::westmere::simd
+} // namespace simd
+
+} // namespace westmere
+} // namespace simdjson
 UNTARGET_REGION
 
 #endif // SIMDJSON_WESTMERE_SIMD_INPUT_H
diff --git a/src/westmere/stage1_find_marks.h b/src/westmere/stage1_find_marks.h
index aef17392..4a1b5e61 100644
--- a/src/westmere/stage1_find_marks.h
+++ b/src/westmere/stage1_find_marks.h
@@ -8,7 +8,8 @@
 #include "westmere/implementation.h"
 
 TARGET_WESTMERE
-namespace simdjson::westmere {
+namespace simdjson {
+namespace westmere {
 
 using namespace simd;
 
@@ -73,7 +74,9 @@ WARN_UNUSED error_code implementation::stage1(const uint8_t *buf, size_t len, pa
   return westmere::stage1::json_structural_indexer::index<64>(buf, len, parser, streaming);
 }
 
-} // namespace simdjson::westmere
+} // namespace westmere
+
+} // namespace simdjson
 UNTARGET_REGION
 
 #endif // SIMDJSON_WESTMERE_STAGE1_FIND_MARKS_H
diff --git a/src/westmere/stage2_build_tape.h b/src/westmere/stage2_build_tape.h
index d8c86347..7105c123 100644
--- a/src/westmere/stage2_build_tape.h
+++ b/src/westmere/stage2_build_tape.h
@@ -7,12 +7,14 @@
 #include "westmere/numberparsing.h"
 
 TARGET_WESTMERE
-namespace simdjson::westmere {
+namespace simdjson {
+namespace westmere {
 
 #include "generic/atomparsing.h"
 #include "generic/stage2_build_tape.h"
 #include "generic/stage2_streaming_build_tape.h"
 
-} // namespace simdjson::westmere
+} // namespace westmere
+} // namespace simdjson
 UNTARGET_REGION
 #endif // SIMDJSON_WESTMERE_STAGE2_BUILD_TAPE_H
diff --git a/src/westmere/stringparsing.h b/src/westmere/stringparsing.h
index 1c3a52a3..e269c982 100644
--- a/src/westmere/stringparsing.h
+++ b/src/westmere/stringparsing.h
@@ -8,7 +8,8 @@
 #include "westmere/bitmanipulation.h"
 
 TARGET_WESTMERE
-namespace simdjson::westmere {
+namespace simdjson {
+namespace westmere {
 
 using namespace simd;
 
@@ -30,7 +31,7 @@ public:
 really_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
   // this can read up to 31 bytes beyond the buffer size, but we require
   // SIMDJSON_PADDING of padding
-  static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1));
+  static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
   simd8<uint8_t> v0(src);
   simd8<uint8_t> v1(src + 16);
   v0.store(dst);
@@ -44,7 +45,8 @@ really_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8
 
 #include "generic/stringparsing.h"
 
-} // namespace simdjson::westmere
+} // namespace westmere
+} // namespace simdjson
 UNTARGET_REGION
 
 #endif // SIMDJSON_WESTMERE_STRINGPARSING_H
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index ac67feac..b4f39cc8 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -93,10 +93,15 @@ if(NOT (MSVC AND MSVC_VERSION LESS 1920))
 
   add_compile_test(readme_examples11 readme_examples.cpp quicktests)
   set_target_properties(readme_examples11 PROPERTIES CXX_STANDARD 11 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
-  target_compile_options(readme_examples11 PRIVATE -Werror)
+  if (!MSVC)
+    target_compile_options(readme_examples11 PRIVATE -Werror)
+  endif()
+
   add_compile_test(readme_examples_noexceptions11 readme_examples_noexceptions.cpp quicktests)
   set_target_properties(readme_examples_noexceptions11 PROPERTIES CXX_STANDARD 11 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
-  target_compile_options(readme_examples_noexceptions11 PRIVATE -Werror)
+  if (!MSVC)
+    target_compile_options(readme_examples11 PRIVATE -Werror)
+  endif()
 
   # Compile tests that *should fail*
   add_compile_test(readme_examples_will_fail_with_exceptions_off readme_examples.cpp quicktests)
@@ -119,6 +124,14 @@ if(MSVC)
         "$<TARGET_FILE_DIR:basictests>")                 # <--this is out-file path
 endif()
 
+# Copy the simdjson dll into the tests directory
+if(MSVC)
+  add_custom_command(TARGET basictests POST_BUILD        # Adds a post-build event
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different  # which executes "cmake -E copy_if_different..."
+        "$<TARGET_FILE:simdjson>"      # <--this is in-file
+        "$<TARGET_FILE_DIR:basictests>")                 # <--this is out-file path
+endif()
+
 ## Next bit should not be needed!
 #if(CMAKE_INTERPROCEDURAL_OPTIMIZATION)
 # next line is a workaround for an odr-violation in basictests regarding the globals 0x432a40 and 0x52045c under clang