RFC: controlling bidirectional mirroring of characters

[Nitai Sasson]

Hello all!

I've been sitting on this for a while, kind of afraid to finish it up and send it. I've finally decided to just do so, even though it's not perfect.

Following the email discussion from [April 2025](https://corp.unicode.org/pipermail/unicode/2025-April/thread.html), I want to propose a combining formatting character to affect the mirroring behavior of arrow characters (and potentially other characters) in bidirectional text. The initial idea for this was originally brought up by Mark E. Shoulson while brainstorming in his first reply.

This is a request for comment and a draft for that proposal.

Please see it at:

https://codeberg.org/NeatNit/unicode-bidi-arrows-proposal/src/branch/main/email.md

Thank you,
Nitai Sasson
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