[issue12892] UTF-16 and UTF-32 codecs should reject (lone) surrogates

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I repeat myself. Even with the patch, UTF-16 codec is faster than UTF-8 codec (except ASCII-only data). This is fastest Unicode codec in Python (perhaps UTF-32 can be made faster, but this is another issue).

> The real question is: Can the UTF-16/32 codecs be made fast
> while still detecting lone surrogates ? Not whether UTF-16
> is widely used or not.

Yes, they can. But let defer this to other issues.

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