[mypyc] Add a special case for str_rprimitive in builder.builtin_len - #10710

[mypyc] Add a special case for str_rprimitive in builder.builtin_len#10710

JukkaL merged 14 commits into

python:masterpython/mypy:masterfrom

97littleleaf11:builtin-len-str97littleleaf11/mypy:builtin-len-strCopy head branch name to clipboard