get(_shadow, prop) {
      assert.fail(
        d`Please report unexpected scope handler trap: ${q(String(prop))}`
      )
    }
AlwaysThrowHandler This is an object that throws if any property is called.
It's used as a proxy handler which throws on any trap called. It's made from
a proxy with a get trap that throws. It's safe to create one and share it
between all Proxy handlers.