[issue41330] Inefficient error-handle for CJK encodings

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

> But how many new Python web application use CJK codec instead of UTF-8?

A CJK character usually takes 2-bytes in CJK encodings, but takes 3-bytes in UTF-8.

I tested a Chinese book:
in GBK:     853,025 bytes
in UTF-8: 1,267,523 bytes

For CJK content, UTF-8 is wasteful, maybe CJK encodings will not be eliminated.

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<https://bugs.python.org/issue41330>
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