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Signature: [const] EdgePairs separation_check (const Region other, unsigned int d, bool whole_edges = false, Region::Metrics metrics = Euclidian, variant ignore_angle = default, variant min_projection = 0, variant max_projection = max, bool shielded = true, Region::OppositeFilter opposite_filter = NoOppositeFilter, Region::RectFilter rect_filter = NoSideAllowed, bool negative = false)
NoSideAllowed seems to be a typo. Probably, NoRectFilter.