LeafProbe
A document child's place under an SDF parent, found by running the parent's ops (leaf-probe).
In the namespace construct::eval. Declared in src/libs/libconstruct/construct/eval/LeafProbe.hpp.
Detailed description
No C++ here knows what an op does (§LPD-2). The probe runs each op's inverse once, from the child out to the root, and checks each run against the op (§LPD-13 check 2). An op with no inverse, or a rejected one, is solved by Newton's method on the op itself. The rotation is the rotation part of the backward chain's derivative; scale and shear are dropped (R2).
All the points of one call run step by step in batches (§LPD-10).