[1.7.x] Fixed #22398 -- Added detail about callable in KEY_FUNCTION docs
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@ -189,7 +189,7 @@ backend class (i.e. ``mypackage.backends.whatever.WhateverCache``).
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KEY_FUNCTION
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~~~~~~~~~~~~
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A string containing a dotted path to a function that defines how to
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A string containing a dotted path to a function (or any callable) that defines how to
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compose a prefix, version and key into a final cache key. The default
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implementation is equivalent to the function::
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