INADA Naoki added the comment:
microbench:
$ ./python.patched -m perf timeit --compare-to `pwd`/python.default -s "d =
b''" -- "d.decode('ascii')"
python.default: ..................... 109 ns +- 1 ns
python.patched: ..................... 102 ns +- 1 ns
Median +- std dev: [python.default] 109 ns +- 1 ns -> [python.patched] 102 ns
+- 1 ns: 1.08x faster (-7%)
$ ./python.patched -m perf timeit --compare-to `pwd`/python.default -s "l =
[42]" -- "l.count(42)"
python.default: ..................... 66.0 ns +- 0.9 ns
python.patched: ..................... 60.0 ns +- 0.3 ns
Median +- std dev: [python.default] 66.0 ns +- 0.9 ns -> [python.patched] 60.0
ns +- 0.3 ns: 1.10x faster (-9%)
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29263>
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