Function JSProxyHandlerOwnPropertyKeys 

pub(crate) unsafe fn JSProxyHandlerOwnPropertyKeys<T>(
    config: JSProxyHandlerOwnPropertyKeysConfig<T>,
    cx: *mut RawJSContext,
    proxy: HandleObject,
    props: MutableHandleIdVector,
) -> bool
where
    T: DomObject,

SAFETY: cx must point to a valid, non-null JS context.