[issue19087] bytearray front-slicing not optimized

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Could you please add unit tests for check that ob_start is used
> instead of memmove()?

How would I do that? Most of the time we don't unit-test performance
improvements (i.e. there are no tests that list.append() is O(1), for
example).

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<http://bugs.python.org/issue19087>
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