Replace compiler-specific fallthrough with more general form #8
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The C++ attribute [[fallthrough]] was standardized in C++ 17 (see: here )
Currently, all major compilers support it :)
On GCC, trying to compile hash.hpp creates a compiler error by default, as it doesn't know about the clang-specific clang::fallthrough attribute.
Replacing it with the more general standardized form fixes compilation on GCC without affecting Clang builds at all.