There are 8 rational/rational?/rationalIfCan, all
of them are defined under
"if R has IntegerNumberSystem then ..."
And seems these functions are not used in other places.
They are basicly wrappers over
retractIfCan : % -> Union(Integer, "failed")
which is from IntegerNumberSystem.
So I think they are not useful and can be removed.
Opinions?
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