The binomial coefficient, the falling and the rising factorial and the double factorial in
double precision, for the compilers, on the terms the interpreter takes them: a whole order is
a product, and any other goes through the gamma function, with NaN at a pole of the
numerator and 0 at one of the denominator, where the reciprocal gamma vanishes. At whole
arguments each is computed exactly and rounded once, as evaluation's exact value is.
https://github.com/asc-community/AngouriMath/issues/2195