cis doesn't check for its argument type
argument must be real according to the spec.
> (cis #c(1 1))
#C(0.1987661 0.30955988)
error should be signalled. semi-related to #489 (closed).
argument must be real according to the spec.
> (cis #c(1 1))
#C(0.1987661 0.30955988)
error should be signalled. semi-related to #489 (closed).