WRITABLE_INDEX   1089 src/runtime.cc         elms->set(WRITABLE_INDEX, heap->false_value());
WRITABLE_INDEX   1101 src/runtime.cc         elms->set(WRITABLE_INDEX, heap->true_value());
WRITABLE_INDEX   1145 src/runtime.cc             elms->set(WRITABLE_INDEX, heap->ToBoolean(!details.IsReadOnly()));
WRITABLE_INDEX   1191 src/runtime.cc     elms->set(WRITABLE_INDEX, heap->ToBoolean(!result.IsReadOnly()));