[BRLTTY] Contraction table fallback.

[Dave Mielke]

[quoted lines by Dave Mielke on 2019/09/23 at 08:40 -0400]

I'm reposting this question (of mine) under a new subject so as to solicit
general discussion. The issue is what should happen when using a contraction
table if a character isn't defined within that table.

>That leaves us with a decision. We have three choices:
>
>1) The way it is now. Use the Unicode replacement character if it's defined,
    else use all eight dots.
>
>2) Use the reaplcement character if defined, else do a text table looukp.
>
>3) Skip the replacement character and just do a text table lookup.
>
>Will one of these do or should we add a (probably rarely used) new selector for
>it?

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