[issue28531] Improve utf7 encoder memory usage

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I fixed many long living bugs in the UTF-7 codec in the past, and I remember that we fixed bugs introduced by using _PyUnicodeWriter or _PyBytesWriter many months after changing the code. Since the UTF-7 codec is rarely used, there is a risk of introducing new long living bug. You should peruse not just the code near the changed lines, but all the codec.

I'm not strongly against this patch, if you Victor takes the responsibility for it, I left it on you.

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assignee:  -> haypo

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<http://bugs.python.org/issue28531>
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