[issue30815] StringIO uses inefficient PyUnicode_AsUCS4

[STINNER Victor]

STINNER Victor added the comment:

"FYI, https://github.com/python/performance/pull/27 will fix performance regression. Python 3 performance is similar to Python 2 after s/warn/warning/"

I was surprised to see that Logger.warn() is slower than Logger.warning()! It is because warn() emits a deprecation warning, thing which isn't cheap...

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