Sci bootstrap order: macros(4/4)→protocols(15/17)→utils(39/47)→types(22/27)→unrestrict(2/2)→vars(28/28)→lang(10/10)→ctx-store(6/6)→namespaces(93/98)→core(60/69). All .cljc; #?(:clj) resolved at read time, #?(:cljs)→nil.
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Janet `last` works only on indexed types (tuple, array). On strings it returns nil. Use `(s (- (length s) 1))` to get the last character of a string, or `(string/slice s (- (length s) 1))` for the last char as string. `(last "hello")` → nil, not `\o`.
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resolve-sym returns `:jolt/not-found` sentinel to distinguish nil local bindings from absent ones, preventing accidental fallthrough to global resolution. Falls back to `clojure.core` namespace for unqualified symbols. `bind-put` helper wraps nil as `:jolt/nil`; resolve-sym unwraps. Multi-arity `fn*` dispatches on fixed-params count vs variadic args.
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Janet `(string :keyword)` returns `"keyword"` (without colon). Use this for keyword→string conversion in destructuring code. Avoid `(name :keyword)` in Jolt evaluation context — `name` is a Janet built-in but may not be available in all eval contexts.
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`:jolt/nil-sentinel` used in `core-bindings` map for vars that should have nil root values. Janet table literals drop nil entries: `@{"*1" nil}` → empty table. `init-core!` unwraps sentinels back to nil with `(if (= fn :jolt/nil-sentinel) nil fn)`. Applies to `*1`, `*2`, `*3`, `*e` and potentially other nil-rooted vars.
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`fn*` and `defmacro` now capture `defining-ns` at definition time and restore it via `(ctx-set-current-ns ctx defining-ns)` / `(ctx-set-current-ns ctx saved-ns)` around body evaluation. This ensures symbols in function/macro bodies resolve in the defining namespace, not the calling context. Applies to both multi-arity and single-arity `fn*` forms.
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SCI load order: `macros` → `protocols` → `types` → `unrestrict` → `vars` → `lang` → `utils` → `namespaces` → `core`. Utils must load after lang (needs `lang/->Namespace`, `vars/unqualify-symbol`). Namespaces needs utils (for `clojure-core-ns`, `dynamic-var`, `unqualify-symbol`). Core needs namespaces (for `*1`, `*2`, `*3`, `*e`, `resolve`).