Just realized that '?' means "unknown transactional status" in %x. That
might cause confusion if a person had a prompt of %x%R. Is that enough
reason to pick a different cue?
"\?\.?[tfz]" seems distinctive enough. Note that %R uses "'=-*^!$( and %x
uses *!?, which means that they already share 2 characters, so adding ?
does not seem like a big issue if it was not one before.
Otherwise, maybe "&" or "%", but it is less about a condition.
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