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[idn] stability
All,
This is probably well known to most of you, but the General Category
Value in the Unicode Character Database and the stability of that value
are not very relevant to IDNA, which does not depend on the Unicode
Categories.
IDNA depends on the Unicode Normalization Form KC table, and there have
been very few changes indeed in this table:
http://www.unicode.org/Public/UNIDATA/NormalizationCorrections.txt
Also, IDNA apps depend on tables for converting from various non-Unicode
encodings to Unicode. This is another place where instability could
affect lookups, potentially even in dangerous ways. Stringprep and IDNA
already mention this issue in their Security Considerations sections.
Erik