Explain the use of 'markRaw' and 'toRaw'.

toRaw returns the original object from a proxy; markRaw prevents an object from ever being made reactive.

toRaw is used to perform read-only operations without proxy overhead. markRaw is vital for performance when storing complex 3rd party class instances or large static objects that don't need tracking. Once marked raw, Vue will never wrap that specific object in a proxy.