Accumulated Feedback on PRI #374

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Date/Time: Fri Mar 30 20:17:26 CDT 2018
Name: Ken Lunde
Report Type: Public Review Issue
Opt Subject: PRI #374 (Proposed Update UTS #39) Feedback

In Section 5.4, "Optional Detection," item 3.b needs to be reconsidered,
mainly because I am not aware of a Unihan Database (aka UAX #38) property
that indicates whether a particular ideograph *is* simplified or
traditional, but there are properties that indicate whether a particular
ideograph *has* a simplified or traditional counterpart, and what its code
point is.

A prototypical example involves U+56FD 国 versus U+570B 國. The former
specifies, via its kTraditionalVariant property value, that the latter is
its traditional counterpart, and the latter specifies, via its
kSimplifiedVariant property value, that the former is its simplified

U+56FD kTraditionalVariant U+570B
U+570B kSimplifiedVariant U+56FD

U+53F0 台 is an exception in that it is considered both a simplified and
traditional form, and in addition to itself, it has three additional
traditional forms, U+6AAF 檯, U+81FA 臺 & U+98B1 颱:

U+53F0 kSimplifiedVariant U+53F0
U+53F0 kTraditionalVariant U+53F0 U+6AAF U+81FA U+98B1

In other words, a more accurate statement, which accounts for the vast
majority of simplified/traditional pairs, is as follows: "Testing for
whether a character is S or T can be based on whether the character has an S
or T variant."