[issue19087] bytearray front-slicing not optimized

[Antoine Pitrou]

Antoine Pitrou added the comment:

> @Antoine: Do you know if your patch may reduce the memory
> fragmentation on "bytearray front-slicing"?

It reduces the number of allocations so, yes, it can reduce memory
fragmentation.
We cannot really use a list of chunks for bytearray since it is
supposed to be usable as a contiguous buffer (using the buffer API).

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