Proposing new arrow characters with Bidi_Mirrored=Yes

[Markus Scherer]

Encoding characters that look the same but behave differently is a bad
idea. We have tried this, for example with letter-behavior clones of some
of the typographic quotes (U+02BB, U+02BC). People use them inconsistently,
because they can't tell the difference while typing or reading, and so we
get problems with having to treat both equally in some places, text search,
spoofing, "why does it say I am using an invalid character?", etc.

Unicode also has some magic invisible control characters that were supposed
to change the behavior of affected characters in ways that violated their
identity. These control codes are Deprecated with prejudice.

markus
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