Serhiy Storchaka added the comment:

> The problem with your approach is that the sequence could be mutated while
> another thread is running (_getbuffer() may release the GIL). Then the
> pre-computed size gets wrong.

Well, then I withdraw my patch.

But what if the sequence will be mutated and PySequence_Size(seq) will become 
less seqlen? Then using PySequence_Fast_GET_ITEM() will be incorrect.

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<http://bugs.python.org/issue15958>
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