> Other languages don't have this problem because there's only a single widely-used implementation. Not true for c/c++ (clang+clang/osx, gcc, msvc, icc - ed: s

> Other languages don't have this problem because there's only a single widely-used implementation. Not true for c/c++ (clang+clang/osx, gcc, msvc, icc - ed: see also stdlib, libc), Java (fewer now, but still many implantations of compiler and vm), Javascript, scheme, standard ml... Arguably it's not even true for Python. Ruby has many implantations, but my impression is that mruby and jruby are mostly insignificant wrt the average ruby programmer. I would say pypy sees more real-world usage, maybe?