Apple WebKit 10.0.2 (12602.3.12.0.1, r210800) - 'constructJSReadableStreamDefaultReader' Type Confusion

exec.argument0; if !stream return throwArgumentTypeErrorexec, scope, 0, "stream", "ReadableStreamReader", nullptr, "ReadableStream"; JSValue jsFunction = stream-get&exec, Identifier::fromString&exec, "getReader"; let rs = new ReadableStream; let cons = rs.getReader.constructor; rs.getReader =...