Currently there is no Map<Transform<...> > specialization. There might be other classes missing, where I don't know how much sense they make (e.g. Translation)
I'll mark this as blocking 3.0, feel free to move it to 3.1 if you are rushing to publish 3.0.
Indeed, I don't see us doing this change at this point for 3.0.
TransformWrapper would be nice too. This needs some refactoring to define a TransformBase<> class doing all the work inherited by three variants:
just like Quaternion.
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