Represent ordinary JavaScript arrays with hole, value, and explicit-undefined states; add sparse side storage and carry missing values through the frontend, native backends, runtime, and Node-facing consumers.
- console.log routes non-scalar arguments through the static inspect machinery
- Union arguments dispatch per arm at runtime; string arms print raw
- Object literals widen per-field into a uniquely-fitting union arm
- The limitations page documents the type surface
- console.log/info/debug/error/warn take unknown[] and render every non-scalar argument through the static util.inspect at the rest-args depth 2, strings verbatim
- top-level unions dispatch per arm at runtime with string arms raw, and util.format's %s/rest args take the same per-arm rule
- info and debug lower as stdout aliases of log; the remaining stock console members are declared in the fallback so stock-clean programs meet per-site SC2020 hints instead of a fallback-manufactured SC0001
- corpus 2440/2441 pin the widened shapes on both backends, console.log(process.argv), a find() miss union, and console.log(undefined) included
- diagnostics snapshots re-pinned: the union console fences retire and utility-types reports its real per-site fences
- tsgo panics computing readonly [] (the empty as-const array) and the facade answers any; the syntax pins the truth, so the record member walk, lowerArrayLiteral, the island-literal route, and lowerAsExpression each repair the shape to the unit-element array
- func arms now map beside data arms in unions (typeof narrows, unionEq compares closures per tag); the diagnostics pin updates
- widthLiftPlan learns tupleArr (tuple fields into array slots, per-position) and emptyArr (unit-only-element arrays reshape to a fresh empty array behind a runtime non-empty trap), so Pick-style {name, aliases} flows lift
- corpus 2428 pins the command-table idiom end to end on both backends
Chris Tate