[issue1943] improved allocation of PyUnicode objects

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Marc-Andre: don't all your objections also apply to the 8bit string
type, which is already a variable-size structure?
Is extending unicode more common than extending str?

With python 3.0, all strings are unicode. Shouldn't this type be
optimized for the same use cases of the previous str type?

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nosy: +amaury.forgeotdarc

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