pub fn cmp_along(
a: &ImplicitPoint,
b: &ImplicitPoint,
u: [f64; 3],
) -> Option<Sign>Expand description
Interval tier of cmp_along — the f64 mirror of fixed::cmp_along: the sign
of (a−b)·u over the homogeneous lambdas. None on a zero-straddle ⇒ the
caller runs the exact I512/BigRational tiers. Closes the latent slow path where
EVERY tri-tri cmp_along skipped the float filter and went straight to bignum.