It seems like building Python on Windows 64-bit emits a few warnings:
D:\a\1\s\Parser\pegen\pegen.c(610,91): warning C4267: '=': conversion from 'size_t' to 'int', possible loss of data [D:\a\1\s\PCbuild\pythoncore.vcxproj]
D:\a\1\s\Parser\pegen\pegen.c(611,52): warning C4267: '=': conversion from 'size_t' to 'int', possible loss of data [D:\a\1\s\PCbuild\pythoncore.vcxproj]
D:\a\1\s\Parser\pegen\pegen.c(612,103): warning C4267: '=': conversion from 'size_t' to 'int', possible loss of data [D:\a\1\s\PCbuild\pythoncore.vcxproj]