pub const STIRLERR_MIN: LargeInt = 9;Expand description
Below this the Stirling series in stirlerr is not accurate to binary64 at any
depth (it is asymptotic, and the smallest term at n = 9 is under 1e-18, at n = 6
it is 1e-14). Callers handle n < STIRLERR_MIN some other way: a table for integers,
or Gamma(n+1) directly, which is cheap and well conditioned at small argument.