Ma Lin <malin...@163.com> added the comment:

> We have a ucd_3_2_0 in unicodedata.

Probably this 3.2 unicodedata is used for IDNA2003.
In IDNA2003 there is a step: normalize the domain_name string to Unicode 
Normalization Form C.

Now we changed the Composition code of Hangul to Unicode Standard 4.1+, and 
fixed the bug even in Unicode Standard 4.1-.
Should this (Unicode Standard 4.1+ behavior) cause a security vulnerability for 
someone who is using IDNA2003 via ucd_3_2_0?

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<https://bugs.python.org/issue29456>
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