Currently, binomial presents results in terms of gamma. And if they evaluate you see a number or with Number real and/or imaginary parts. In #18960 we are experimenting with changing this so the class remains unevaluated unless it evaluates into an expression free of the writing function, `gamma`. So `binomial(nt, Rational(15, 6))` would remain unevaluated instead of becoming `8*gamma(nt + 1)/(15*sqrt(pi)*gamma(nt - Rational(3, 2)))`. This expression can be obtained by using `.rewrite(gamma)` and will evaluate to a numerical value with `evalf`.
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