Support NamedTuple of different ordering #120
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I came across the problem described in #100, and for my use case (users provide named tuples that are
inverse-transformed with a pre-defined transform) it would be convenient to support different orderings of NamedTuples in TransformTuple{<:NamedTuple}. Of course, one can argue that a NamedTuple with a different order of names is not in the image of the transform (as everytransformed result is a NamedTuple of a different order), but I think in practice in most applicationsNamedTuples with differently ordered names are expected to behave in the same way and in the context of the transform one could justify this by operating with equivalence classes of named tuples with the same set of names.So in this PR I propose to allow for differently ordered NamedTuples in the NamedTuple transform. However, if the NamedTuple is a superset still an error is thrown. This felt consistent with the dimension/size checks for array transforms.