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A shell's `forward` is about the surface the face's (u, v) are on, its NURBS form when it has one, which may run against its cylinder, cone, sphere or torus. The kernel read it against the analytic surface, so a fillet's bore whose form runs the other way was a shaft and an M10 thread was refused in its 8.5 mm hole. `Face::form_turns` says when the form turns the normal. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>