Thanks for your very informative reply.
I replied you in issue41486. Maybe memory blocks will not bring performance
improvement to _PyBytesWriter/_PyUnicodeWriter, which is a bit frustrating.
> For a+b, Python first computes "a", then "b", and finally "a+b". I don't see
> how your API could optimize such code.
I mean this situation:
s = 'a' * 100_000_000 + '\uABCD'
b = s.encode('utf-8')
b.encode('utf-8') # <- this situation
I realize I was wrong, the UCS1->UCS2 transformation will only be done once, it
only saves a memcpy().
Even in this case it will only save two memcpy():
s = 'a' * 100_000_000 + '\uABCD' * 100_000_000 + '\U00012345'
b = s.encode('utf-8')
b.encode('utf-8')
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