unifinv and colleagues with single arguments

[Francesco Potorti`]

unifinv (single(0.5), 1, 3) returns a double in 3.1.54.

Is this anticipated and correct?

Maybe it should return a single if either of its arguments is single.

Is there an easy way of determining if a returned value is single?  The
only way that I have found is to assign it to a variable and use whos on it.

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