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Malte Ubl
bc89955859
A stale narrowing read in a call argument whose parameter accepts the declared type read as declared, so the callee's lowering tests the stored value. For standard-library callees that lowering is often specialized to the argument types programs pass: after `combo.p = {...}; combo()` the argument of `JSON.stringify(combo.p)` became `T | undefined` (SC1090), and after `ci(slow)` the handle of `timers.clearInterval(fast)` became `number | null` (SC2020), so 2072-expando-function-members.ts and 1804-timers-module.ts stopped compiling.
Call and construction arguments (directly or inside literal arguments) now read as declared only where the callee lowers any value of the parameter type: user callees, console methods, and standard-library parameters typed by a type parameter (`push(...items: T[])`, `Map.set`). Other standard-library arguments keep the checker's narrowing and the checked extraction.