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This is fixed without any effort in our Text::Properties structure:
o A ctp can be an empty string.
o An stp is an array of ctps.
They're ordered by definition, even if they're of zero length.
Another oddity is that one of our "ctp"s can itself
be a string. We're not forced to just stash one
character in each. That might be useful as an
efficiency hack when you want a series of adjacent
characters to have the same property settings (a very
common case, really).
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