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There is one engine and nine doors into it, and nothing until now checked that the doors agree. CI tested each binding against itself: the Python wheel imported, the C demo compiled, the npm package type-checked. None of that would have caught a field that crosses one boundary wrong, which is the failure this library is most exposed to, because a wrong answer about a fast day looks exactly like a right one. So: twelve days, chosen where the bindings could plausibly differ, and all twenty-two fields compared against what the command line says. The days are Pascha itself, the Nativity on both calendars, a Wednesday of the Great Fast under Byzantine Catholic law and again at the Typikon, a weekday of the Nativity Fast where Greek and Slavic usage part, the one Orthodox church on the Gregorian Paschalion, and a day with no feast. A release now runs what a push runs. It had been gated on cargo test alone, so the C ABI, the Lua binding, the Python parity check and the README examples were checked on the branch that led to a release and not on the release. Neither registry will reuse a version, so the gate belongs before the upload. Writing it found three things. The npm exports map did not expose the wasm by package path, so a bundler asked for typikon/web/typikon_bg.wasm was told no such path exists and had to reach into node_modules; the documented init() call was never affected. The suite could hang instead of fail, because the test web server was backgrounded inside a subshell and killed by job spec, leaving bash in do_wait forever. And pointing XDG_CONFIG_HOME at a path that does not exist isolates typikon and breaks every other program that keeps state under it, a browser included. A surface whose toolchain is missing is named as skipped, and fewer than three surfaces running is a failure rather than a pass, so a container with nothing installed cannot come out green.
Parity
Every binding answers the same question, so every binding has to give the same answer. These probes ask each one for the same twelve days and compare all twenty-two fields against what the command line says.
The probes are chosen for the places the bindings could plausibly disagree: Pascha itself, the Nativity on both calendars, a Wednesday of the Great Fast under Byzantine Catholic law and again at the Typikon, a weekday of the Nativity Fast where Greek and Slavic usage part, the one Orthodox church on the Gregorian Paschalion, and a day with no feast at all.
Run them with tests/parity.sh. Surfaces whose toolchain is absent are skipped
by name rather than silently passed.