[issue30815] StringIO uses inefficient PyUnicode_AsUCS4

[STINNER Victor]

STINNER Victor added the comment:

There was a discussion to use an adaptative implementation depending *how* the API is used. Write only is different than write, seek back, write, read, seek, etc.

The idea was used unicode writer when it's the most efficient, write only, and switch to something else (ex: current code) when other methods are used.

See bpo-15612.

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nosy: +haypo, pitrou

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