pub const KNOT_IDENTITY_TOL: f64 = 1e-9;Expand description
Knot IDENTITY tolerance (parameter-space): two knot parameters within this
absolute band are treated as the SAME knot for snapping — insert_knot,
NurbsCurve::split, monotonicity and clamp checks. This is the single
source for the “absolute 1e-9 knot tolerance” that split enforces and
that imprint’s trim guards mirror. Distinct in PURPOSE (not just value)
from KNOT_DEDUP_EPS; the two are deliberately NOT unified.