[issue1943] improved allocation of PyUnicode objects

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> I find that the null termination for 8-bit strings makes low-level
> parsing operations (e.g., parsing a numeric string) safer and easier:

Not to mention faster. The new IO library makes use of it (for newline
detection), on both bytestrings and unicode strings.

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<http://bugs.python.org/issue1943>
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