Stefan Krah <ste...@bytereef.org> added the comment:

Thanks, I can confirm that the speedup for memoryview.cast() is large in 
microbenchmarks.

Still, if the speedup cannot be seen in programs like test_buffer,
the amount of code that's being added for a speedup < 5% in real
world programs is quite substantial (if you count the generated
code and the fast_call machinery).

But we can leave it in.  Preemptively, if someone sees this and
thinks the flood gates are open for _decimal:  No, it won't be
converted to AC.

----------
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41262>
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