053ed4f790
- types.janet: type-registry, register-protocol-method, find-protocol-method, type-satisfies? - core.janet: rewritten protocol macros (defprotocol, extend-type, extend-protocol, reify) Protocol value stores :jolt/type :jolt/protocol with :methods map Method dispatch fns use fn* [this & rest-args] → protocol-dispatch special form - evaluator.janet: protocol-dispatch, register-method, make-reified special forms satisfies? special form with type registry lookup special-symbol? entries for all 3 protocol ops + satisfies? - 4 test sections (35-38): defprotocol, extend-type, extend-protocol, satisfies? extend-type: basic dispatch works (42 constant), .-field accessor needs further debug satisfies?: fully functional with type registry - 315 ok, 2 fail (pre-existing, unchanged)
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Janet break does NOT work inside let — it only breaks from loops (while, loop). When searching for a key in a bucket and needing to return a value, use (var found nil) + (set found val) (break) pattern then check found after the loop. Same for break nil in bucket-dissoc: capture index in a var, break, then construct result after loop.
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Keywords containing # (like :#inst, :#uuid) are invalid Janet literal syntax. Use dynamic table construction: (let [dr @{}] (put dr (keyword "#inst") fn) dr) instead of @{:#inst fn}. This hit us in types.janet make-ctx :data-readers initialization.
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PHM/Set internal metadata keys (:jolt/deftype, :cnt, :buckets, :_meta, :jolt/type, :phm) leak into pairs/keys iteration. Must filter them in core fns like merge, merge-with, keys, vals, and in print-rendering code. core-merge without filtering produced corrupted PHMs with metadata as entries. Commit 9c44021 fixed this for merge; c366963 for print-value.
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Janet's case for multi-arity dispatch: (defn f [& args] (case (length args) 1 ... 2 ...)). Used in core-derive, core-isa?, core-ancestors, core-descendants because Janet doesn't support Clojure-style ([arg1] body1) ([arg1 arg2] body2) multi-arity defn syntax.