[issue17694] Enhance _PyUnicodeWriter API to control minimum buffer length without overallocation

[STINNER Victor]

New submission from STINNER Victor:

The _PyUnicodeWriter API is used in many functions to create Unicode strings, especially decoders. Performances are not optimal: it is not possible to specify the minimum length of the buffer if the overallocation is disabled. It may help #17693 for example.

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messages: 186537
nosy: haypo, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Enhance _PyUnicodeWriter API to control minimum buffer length without overallocation
versions: Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17694>
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