- `Promise.all([p, q, r])` over different promise types (the tuple
overload) lowers in TypeScript through one interned async helper that
awaits the runtime combinator over the same promises (widened to
Promise<void>, a type-only view), so settlement order and rejection
handling are Node's, then reads each fulfilled entry into the tuple.
Entries keep their identity; plain scalar entries pass through, and a
checked-dynamic entry joins through the promise it holds.
- The ambient `Boolean` as an `every`/`some`/`find`/`findIndex`/`map`
callback in TypeScript is the interned one-parameter truthiness
closure `filter(Boolean)` already used, and `filter(Boolean)` accepts
checked-dynamic elements (runtime truthiness).
- `E[key]` with a runtime string key answers the named member's constant,
or undefined for a name no member carries; a numeric member's reverse
key and inherited Object.prototype names throw a named runtime refusal.
- Regex-argument `replace`/`replaceAll`/`split`/`search`/`matchAll` on a
`string | undefined` receiver take the string lowering and throw Node's
"Cannot read properties of undefined (reading 'replace')".
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
