[Python-Dev] pyc files, constant folding and borderline portability issues

Hello, There are a couple of ancillary portability concerns due to optimizations which store system-dependent results of operations between constants in pyc files: - Issue #5057: code like '\U00012345'[0] is optimized away and its result stored as a constant in the pyc file, but the result should be different in UCS-2 and UCS-4 builds. - Issue #5593: code like 1e16+2.9999 is optimized away and its result stored as a constant (again), but the result can vary slightly depending on the internal FPU precision. These problems have probably been there for a long time and almost no one seems to complain, but I thought I'd report them here just in case. Regards Antoine.