Filters #573
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Filters #573
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Description
This PR defines filters in posets, and proves some basic facts about them.
I've also added some basic supporting infrastructure for directed sets. At some point we should port DCPOs over to use this, but this is probably best done in a separate PR.
Checklist
Before submitting a merge request, please check the items below:
support/sort-imports.hs(ornix run --experimental-features nix-command -f . sort-imports).If your change affects many files without adding substantial content, and
you don't want your name to appear on those pages (for example, treewide
refactorings or reformattings), start the commit message and PR title with
chore:.