encoding: add fast path of jsonescape() (
issue5533)
This isn't highly optimized as it copies characters one by one, but seems
reasonably simple and not slow.
(with mercurial repo)
$ export HGRCPATH=/dev/null HGPLAIN=
$ hg log --time --config experimental.stabilization=all -Tjson > /dev/null
(original)
time: real 6.830 secs (user 6.740+0.000 sys 0.080+0.000)
time: real 6.690 secs (user 6.650+0.000 sys 0.040+0.000)
time: real 6.700 secs (user 6.640+0.000 sys 0.060+0.000)
(this patch)
time: real 5.630 secs (user 5.550+0.000 sys 0.070+0.000)
time: real 5.700 secs (user 5.650+0.000 sys 0.050+0.000)
time: real 5.690 secs (user 5.640+0.000 sys 0.050+0.000)
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