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As discussed in #873, the basic idea is that if facets are represented as the facet of the cell that they bound (as in
t2f
), as opposed to by the points that support them (as in.facets
) then they are intrinsically oriented and already almost effectively serialized as oriented by #681; just a little more care has to be taken to handle awkward cases (as intest_mesh.test_meshio_cycle_boundaries
which involves inconsistently oriented “boundaries”) and to infer the orientation on decoding.This replaces botched attempts in #874 and #875.