b1715f49b4
The two generator strategies re-parsed the grammar inside their prop_map, once per generated case: the same defect improvise-8shu fixed in improvise-io. A OnceLock takes the lib test binary from ~0.9s to ~0.06s on the same machine and load. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze