Libfyaml adds a YAML/JSON parse cache; 427 MB reloads in 36 ms

Libfyaml 1.0.0-alpha7 introduces an opt-in transparent parse cache that, on cache hits, uses mmap to bypass parsing entirely, enabling a 427 MB YAML/JSON file to reload in 36 ms. This feature is designed for developers working with large, stable configuration files who need near-instantaneous repeated access without modifying their parsing code. It is interesting because it achieves dramatic speed improvements not by accelerating the parser itself, but by caching the parsed memory structure for direct reuse.