equals
Rounded identity: equal when every component matches at the SCALE quantum.
Raw components may drift within the quantum and still compare equal. The weight participates: a point at infinity never equals a finite point, and at-infinity magnitudes compare as data. Identity is exact-class with one carve-out: a Direction and a plain FlatPoint are the same kind of value — the refinement adds no data — and compare by components alone, in both directions. Any other subclass instance and a plain FlatPoint never compare equal.
Return
true iff other shares this object's identity domain and its three components all match after rounding.
Parameters
other
The object to compare against.