Commit to factories as the mechanism to lookup type adapters. This uses factories for type hierarchy adapters. We keep a separate list of factories for tree-style adapters registered with registerTypeHierarchyAdapter to guarantee that these come after the non-hierarchy adapters.
This drops support for type hierarchy instance creators. I don't expect this to be a problem. We'll also detect fewer errors where multiple type adapters can serialize the same type. With APIs like getNextTypeAdapter, I think this might actually be an improvement!
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