diff --git a/Makefile b/Makefile
index 844afedd..e6ceba29 100644
--- a/Makefile
+++ b/Makefile
@@ -92,10 +92,10 @@ ujdecode.o: $(UJSON4C_INCLUDE)
 	$(CC) $(CFLAGS) -c dependencies/ujson4c/src/ujdecode.c 
 
 parsingcompetition: benchmark/parsingcompetition.cpp $(HEADERS) $(LIBFILES) $(OBJECTS)
-	$(CXX) $(CXXFLAGS)  -o parsingcompetition $(LIBFILES) benchmark/parsingcompetition.cpp ujdecode.o -I. $(LIBFLAGS)
+	$(CXX) $(CXXFLAGS)  -o parsingcompetition $(LIBFILES) benchmark/parsingcompetition.cpp $(OBJECTS) -I. $(LIBFLAGS)
 
-allparserscheckfile: tests/allparserscheckfile.cpp $(HEADERS) $(LIBFILES)
-	$(CXX) $(CXXFLAGS) -o allparserscheckfile $(LIBFILES) tests/allparserscheckfile.cpp -I. $(LIBFLAGS)
+allparserscheckfile: tests/allparserscheckfile.cpp $(HEADERS) $(LIBFILES) $(OBJECTS)
+	$(CXX) $(CXXFLAGS) -o allparserscheckfile $(LIBFILES) tests/allparserscheckfile.cpp $(OBJECTS) -I. $(LIBFLAGS)
 
 parsehisto: benchmark/parse.cpp  $(HEADERS) $(LIBFILES)
 	$(CXX) $(CXXFLAGS) -o parsehisto benchmark/parse.cpp $(LIBFILES) $(LIBFLAGS) -DBUILDHISTOGRAM
diff --git a/README.md b/README.md
index 4ce59f53..0cf74366 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,9 @@ To simplify the engineering, we make some assumptions.
 ## Features
 
 - We parse integers and floating-point numbers as separate types which allows us to support large 64-bit integers.
-- We do full UTF-8 validation as part of the parsing.
+- We do full UTF-8 validation as part of the parsing. (Parsers like fastjson, gason and dropbox json11 do not do UTF-8 validation.)
+- We fully validate the numbers. (Parsers like gason and ultranjson will accept `[0e+]` as valid JSON.)
+- We validate string content for unescaped characters. (Parsers like fastjson and ultrajson accept unescaped line breaks and tags in strings.)
 
 ## Architecture
 
diff --git a/benchmark/parsingcompetition.cpp b/benchmark/parsingcompetition.cpp
index 39218eb8..b1ca42a3 100644
--- a/benchmark/parsingcompetition.cpp
+++ b/benchmark/parsingcompetition.cpp
@@ -1,4 +1,4 @@
-
+#include <unistd.h>
 #include "jsonparser/jsonparser.h"
 
 #include "benchmark.h"
@@ -26,7 +26,7 @@ using namespace std;
 
 // fastjson has a tricky interface
 void on_json_error( void *, const fastjson::ErrorContext& ec) {
-  std::cerr<<"ERROR: "<<ec.mesg<<std::endl;
+  //std::cerr<<"ERROR: "<<ec.mesg<<std::endl;
 }
 bool fastjson_parse(const char *input) {
   fastjson::Token token;
@@ -37,17 +37,32 @@ bool fastjson_parse(const char *input) {
 // end of fastjson stuff
 
 int main(int argc, char *argv[]) {
-  if (argc < 2) {
+  bool verbose = false;
+  bool all = false; 
+  int c;
+  while ((c = getopt (argc, argv, "va")) != -1)
+    switch (c)
+      {
+      case 'v':
+        verbose = true;
+        break;
+      case 'a':
+        all = true;
+        break;
+      default:
+        abort ();
+      }
+  if (optind >= argc) {
     cerr << "Usage: " << argv[0] << " <jsonfile>\n";
     cerr << "Or " << argv[0] << " -v <jsonfile>\n";
+    cerr << "To enable parsers that are not standard compliant, use the -a flag\n";
     exit(1);
   }
-  bool verbose = false;
-  if (argc > 2) {
-    if (strcmp(argv[1], "-v"))
-      verbose = true;
+  const char * filename = argv[optind];
+  if(optind + 1 < argc) {
+    cerr << "warning: ignoring everything after " << argv[optind  + 1] << endl;
   }
-  pair<u8 *, size_t> p = get_corpus(argv[argc - 1]);
+  pair<u8 *, size_t> p = get_corpus(filename);
   if (verbose) {
     std::cout << "Input has ";
     if (p.second > 1024 * 1024)
@@ -88,15 +103,15 @@ int main(int argc, char *argv[]) {
 
   BEST_TIME("sajson (static alloc)", sajson::parse(sajson::bounded_allocation(ast_buffer, astbuffersize), sajson::mutable_string_view(p.second, buffer)).is_valid(), true, memcpy(buffer, p.first, p.second), repeat, volume, true);
   std::string json11err;
-  BEST_TIME("dropbox (json11)     ", json11::Json::parse(buffer,json11err).is_null(), false, memcpy(buffer, p.first, p.second), repeat, volume, true);
+  if(all) BEST_TIME("dropbox (json11)     ",  (( json11::Json::parse(buffer,json11err).is_null() ) || ( ! json11err.empty() )), false, memcpy(buffer, p.first, p.second), repeat, volume, true);
 
-  BEST_TIME("fastjson             ", fastjson_parse(buffer), true, memcpy(buffer, p.first, p.second), repeat, volume, true);
+  if(all) BEST_TIME("fastjson             ", fastjson_parse(buffer), true, memcpy(buffer, p.first, p.second), repeat, volume, true);
   JsonValue value;
   JsonAllocator allocator;
   char *endptr;
-  BEST_TIME("gason             ", jsonParse(buffer, &endptr, &value, allocator), JSON_OK, memcpy(buffer, p.first, p.second), repeat, volume, true);
+  if(all) BEST_TIME("gason             ", jsonParse(buffer, &endptr, &value, allocator), JSON_OK, memcpy(buffer, p.first, p.second), repeat, volume, true);
   void *state;
-  BEST_TIME("ultrajson         ", (UJDecode(buffer, p.second, NULL, &state) == NULL), false, memcpy(buffer, p.first, p.second), repeat, volume, true);
+  if(all) BEST_TIME("ultrajson         ", (UJDecode(buffer, p.second, NULL, &state) == NULL), false, memcpy(buffer, p.first, p.second), repeat, volume, true);
   BEST_TIME("memcpy            ", (memcpy(buffer, p.first, p.second) == buffer), true, , repeat, volume, true);
   free(p.first);
   free(ast_buffer);
diff --git a/tests/allparserscheckfile.cpp b/tests/allparserscheckfile.cpp
index dd9ff3d0..483c8756 100644
--- a/tests/allparserscheckfile.cpp
+++ b/tests/allparserscheckfile.cpp
@@ -8,9 +8,32 @@
 #include "rapidjson/reader.h" // you have to check in the submodule
 #include "rapidjson/stringbuffer.h"
 #include "rapidjson/writer.h"
-
+#include "json11.cpp"
 #include "sajson.h"
+#include "fastjson.cpp"
+#include "fastjson_dom.cpp"
+#include "gason.cpp"
+extern "C"
+{
+#include "ultrajsondec.c"
+#include "ujdecode.h"
 
+}
+using namespace rapidjson;
+using namespace std;
+
+
+// fastjson has a tricky interface
+void on_json_error( void *, const fastjson::ErrorContext& ec) {
+  //std::cerr<<"ERROR: "<<ec.mesg<<std::endl;
+}
+bool fastjson_parse(const char *input) {
+  fastjson::Token token;
+  fastjson::dom::Chunk chunk;
+  std::string error_message;
+  return fastjson::dom::parse_string(input, &token, &chunk, 0, &on_json_error, NULL);
+}
+// end of fastjson stuff
 
 
 
@@ -56,11 +79,24 @@ int main(int argc, char *argv[]) {
   bool rapid_correct = (d.Parse((const char *)buffer).HasParseError() == false);
   bool rapid_correct_checkencoding = (d.Parse<kParseValidateEncodingFlag>((const char *)buffer).HasParseError() == false);
   bool sajson_correct = sajson::parse(sajson::dynamic_allocation(), sajson::mutable_string_view(p.second, buffer)).is_valid();
+  std::string json11err;
+  bool dropbox_correct = (( json11::Json::parse(buffer,json11err).is_null() ) || ( ! json11err.empty() )) == false;
+  bool fastjson_correct =  fastjson_parse(buffer);
+  JsonValue value;
+  JsonAllocator allocator;
+  char *endptr;
+  bool gason_correct = (jsonParse(buffer, &endptr, &value, allocator) == JSON_OK);
+  void *state;
+  bool ultrajson_correct = ((UJDecode(buffer, p.second, NULL, &state) == NULL) == false);
   printf("our parser                 : %s \n", ours_correct ?   "correct":"invalid");
   printf("rapid                      : %s \n", rapid_correct ?  "correct":"invalid");
   printf("rapid (check encoding)     : %s \n", rapid_correct_checkencoding ?  "correct":"invalid");
   printf("sajson                     : %s \n", sajson_correct ? "correct":"invalid");
-   
+  printf("dropbox                    : %s \n", dropbox_correct ? "correct":"invalid");
+  printf("fastjson                   : %s \n", fastjson_correct ? "correct":"invalid");
+  printf("gason                      : %s \n", gason_correct ? "correct":"invalid");
+  printf("ultrajson                  : %s \n", ultrajson_correct ? "correct":"invalid");
+       
   free(buffer);
   free(p.first);
   deallocate_ParsedJson(pj_ptr);