Error subclass loses `cause` when forwarding options via super(message, options)

[proggeramlug]

Perry version: origin/main @ a674b6e (v0.5.1167)
Platform: macOS arm64 (Darwin 25.5)
Build/run: perry repro.ts -o out && ./out
Baseline: node --experimental-strip-types repro.ts

(Found via an internal worst-case stress suite.)

Bug

A subclass of Error that forwards options via super(message, options) loses the cause — this.cause is undefined afterward. A plain new Error(msg, { cause }) (no subclass) works, so the option is dropped specifically when passed up through super(...).

Repro

class AppError extends Error {
  constructor(msg: string, opts?: ErrorOptions) { super(msg, opts); this.name = "AppError"; }
}
const e = new AppError("high-level", { cause: new TypeError("low-level") });
console.log(e.message, (e.cause as Error)?.message);

Expected (Node)

high-level low-level

Actual (Perry)

high-level undefined