[issue30815] StringIO uses inefficient PyUnicode_AsUCS4

[INADA Naoki]

INADA Naoki added the comment:

I'm sorry, it's my mistake.

I used vmprof on mac and I thought as_ucs4 is bottleneck.
But vmprof on Linux (and perf) shows totally different result.

Maybe, current vmprof doesn't work well for native code on macOS.

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resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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<http://bugs.python.org/issue30815>
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