On Thursday, November 5, 2015 at 10:42:47 AM UTC-8, Eric Gourgoulhon wrote: > > > So we see that the objects used as keys are charts, vector frames and > manifolds. > I think that's a very strong reason to go with equality-by-id and *not* unique representation: You really don't want to risk that for such structural information you end up with a key that is accidentally equal to another one.
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