Currently, no AssetID recycle is in mind. It will only invalidate the asset for disposing it on an appropriate time
Use it to clear the engine.
Action for when the asset finishes loading Proabably be executed on the main thread
Currently not in use
Use it to insert into an asset pool, alias
Usage inside asset manager
How much time it took to load, in millis
When it started loading
Should return if the asset is ready for use