Changing gruntz to use csign instead of sign would sometimes allow gruntz to return a nounform instead of an error; example:
sign: argument cannot be imaginary; found %i
Because "gruntz" is an algorithm, rather than a mathematically defined
concept like "integrate" or "limit", I don't think it makes sense for gruntz
to return a noun form. The algorithm does not apply to complex values,
so calling it on a complex value is an error.
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