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Trying to update a mod to 1.13, and previous methods of saving WorldSaveData to World don't seem to work.

How does this work in 1.13?

This is the part I am having trouble with:

public class CrateStackCollection extends WorldSavedData
{
	...
	public static CrateStackCollection get( World world )
	{
		final CrateStackCollection collection = (CrateStackCollection)world.loadData( CrateStackCollection.class, filename );
		if( collection == null )
		{
			collection = new CrateStackCollection();
			world.setData( filename, collection );
		}
		return collection;
	}
	...
}

The problem appears to be that world.loadData and world.setData are undefined in 1.13. I have also tried, as suggested by the Forge docs:

...
	public static CrateStackCollection get( World world )
	{
		MapStorage storage = world.getMapStorage();
		final CrateStackCollection collection = (CrateStackCollection)storage.getOrLoadData( CrateStackCollection.class, filename );
		if( collection == null )
		{
			collection = new CrateStackCollection();
			storage.setData( filename, collection );
		}
		return collection;
	}
...

But that also does not work for a whole different set of reasons. (I believe that part of the docs may not have been updated to 1.13 yet)

How do I use that?

When I look at ISaveDataAccess, all I see is a bunch of func_... with no understanding of what they actually do.