[mypyc] Speed up BytesWriter append, write and len operations #20380
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JukkaL
changed the title
p-sawicki
approved these changes
Dec 9, 2025
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These made two microbenchmarks 1.3x to 4.4x faster. Make it possible to inline some functions, and support a faster calling convention by linking the C function for
writestatically.This means that we can't change the internal representation of BytesWriter without breaking backward compatibility after we make BytesWriter non-experimental.