Follow-up Comment #1, bug #68513 (group groff): No, any nonnegative `int` is accepted as a character index.
Values larger than 255 are otherwise hard to work with though, as there's a
fixed-size `charset_table` array of 256 entries, and hyphenation codes are
limited to 0-255 as well.
Possibly all you can do with a big character index/"number" like 999 is to
tell the formatter to render the glyph of that index in the current font.
I guess you could set character flags on it.
DWB _troff_ accepted negative character indices in the `\N` escape sequence
but, apparently, would not emit them as-is in "trout" "N" commands.
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