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5fcd7f2948
Curve (NL_CURVE) with accessors, sizing, copy, predicates (closed, degen, line, planar, z0), rationality/dimension conversions, num/denom split, conic data and cross-boundary derivative curves. N_CrvsAreCoincident calls N_CrvsMakeCompatible (nlib.crv_tool_p2), stubbed as UNPORTED. Difftest: 3417 cases, 3139 bit-identical, 278 deferred. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>