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20b6629Drop 19.09 support (#947)Michael Peyton Jones 3a989b5'although' was repeated accidentally (#275)zx9w 0696aebtests: update nixpkgs pin to 19.09 channel (#260)Rodney Lorrimar 5884ab0Overlays (#261)Moritz Angermann b4b18edDocs improvements (#171)Rodney Lorrimar