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Allow specifying differential class in frame init - #6317
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(from holidays, no brief) I had removed this more or less on purpose, with the logic was that you should never be able to set a differential class inconsistent with a base class anyway, so that, e.g., sphericalcoslat would just set the differential class and representation. but I do see that this makes unitspherical impossible, and this seems a reasonable solution. Still not 100% sure it is necessary to have this short-cut to passing a dict to representation, but only -0, so since you both feel it is worth it, OK to proceed.
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Allow specifying differential class in frame init
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Fixes #6314
This adds support for specifying a differential class in the frame intializers, which should mirror the way passing in a representation class works. This supports, e.g.:
(also
differential_cls={'s': coord.CartesianDifferential})This also decouples setting the representation class from setting the differential class, so this is now valid as long as the differential class is compatible with the representation: