Language Analysis Systems, Inc. Unicode list reader scripsit:

> It suggests that for many fonts,
> 
> U+0067 LATIN SMALL LETTER G + U+0327 COMBINING CEDILLA
> 
> and 
> 
> U+0067 LATIN SMALL LETTER G + U+0312 COMBINING TURNED COMMA ABOVE
> 
> would have exactly the same rendering.  Some applications would need to
> know this and treat U+0067 U+0327 the same as U+0067 U+0312 as
> equivalent.

There is no requirement that any given font make all characters distinguishable.
Many characters are almost always indistinguishable anyhow (A vs. Alpha vs.
Cyrillic A); many may be indistinguishable, as Latin alpha vs. Greek alpha,
or even Latin a vs. Latin alpha (which means the font is not usable for IPA,
but that's allowed).  The Last Resort font makes all Greek letters
indistinguishable, all Cyrillic letters indistinguishable, etc. etc.

> I wonder if there's call for some sort of table of Unicode sequences
> that aren't canonically equivalent but render the same.

Such a thing would be highly font-dependent and variable.

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