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2011/11/1 Ben Kelly <>:
>  there's no technical reason why lua couldn't
> permit ?, !, ∀, and so forth.

The third of your examples is locale-dependent.  On my computer it
shows the same glyph as u2200, but that will not be true for
everybody. Not a technical reason, but potentially confusing.

BTW, is there a technical reason why in Lua 5.2 "\u2200" can't mean
"the UTF-8 encoding of the Unicode symbol u2200" instead of giving
"invalid escape sequence"?  Apart from requiring an update to the `%q`
format option?