[ refactor ] Symmetry of Bijection
as a consequence of properties of a given Surjective
function
#2583
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Alternative version of #2569 which dispenses with much of the deprecation cruft, in favour of badging this as a
bug
fix.No separate
module Section
added, in favour of folding everything into the definitions ofFunction.Structures.IsBijection
andFunction.Bundles.Bijection
.NB. there may now be some further redundancy that could be pruned out: manifest fields, or
Properties
?