[issue21081] missing vietnamese codec TCVN 5712:1993 in Python

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Since no Unicode mapping table is found at the Unicode website, we need at least the link to public official document that specifies the encoding.

If VN3 is a subset of VN2, which itself is a subset of VN1, VN1 definitely looks the most preferable choice for including in Python distribution. Especially if it was chosen by other popular software.

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stage: needs patch -> patch review
versions: +Python 3.7 -Python 3.5

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