JsonMergePatchDocument - Why "Cannot apply more than once" ?

[aaronclawrence]

I noticed that I can only use ApplyTo once. The second time it throws NotSupportedException("Cannot apply more than once");

I can't see why that restriction is enforced. Who cares if you apply it more than once? It looks like it will work just fine...

[aaronclawrence]

Hm, I see it removes the "add" operations, not sure why...