INADA Naoki added the comment:
performance impact
best case:
$ ./python.patched -m perf timeit --compare-to=`pwd`/python.default -- '{}'
python.default: ..................... 36.9 ns +- 0.9 ns
python.patched: ..................... 25.3 ns +- 0.7 ns
Mean +- std dev: [python.default] 36.9 ns +- 0.9 ns -> [python.patched] 25.3 ns
+- 0.7 ns: 1.46x faster (-31%)
worst case:
$ ./python.patched -m perf timeit --compare-to=`pwd`/python.default -- 'x={};
x["a"]=1'
python.default: ..................... 73.3 ns +- 1.2 ns
python.patched: ..................... 82.8 ns +- 1.8 ns
Mean +- std dev: [python.default] 73.3 ns +- 1.2 ns -> [python.patched] 82.8 ns
+- 1.8 ns: 1.13x slower (+13%)
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<http://bugs.python.org/issue30040>
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