Supports "Any" in loader types

[elijahbenizzy]

There are certain cases where the loader can load any datatype , E.G. pickle-type loaders. Before this didn't work. The "proper" solution would be to change custom_subclass_check, but that has the possibility of breaking some cases of materialization as we have not always been consistent here. In this case, it just uses a loader with Any if another has not been specified. While this might casue the order to be slightly counter-intuitive, it will ensure full backwrads compatibility.

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