"I implemented PRML in two languages. Three things broke that the spec didn't warn about." published: true

PRML v0.1 is a small specification I drafted three weeks ago. It binds an ML evaluation claim — (metric, comparator, threshold, dataset hash, random seed, producer) — to a SHA-256 digest computed over canonical YAML bytes, before the experiment runs. The spec is at spec.falsify.dev/v0.1 . The Python reference implementation is on GitHub. v0.2 freezes 2026-05-22. A specification with one implementation is indistinguishable from that implementation's bugs. So this past weekend I sat down and built