Pinging all language, framework, and ecosystem owners to consolidate feature freeze items for the 20.09 release.

Please mention any items you see blocking the 20.09 release in your given domains

Items brought up will be discussed in a Feature freeze meeting at a later date.

Nix/nix-cli ecosystem: @edolstra @grahamc @nbp @Profpatsch
Mobile: @samueldr
Nixos Modules / internals : @infinisil @matthewbauer @Ericson2314 @orivej
Nixos tests: @tfc

Emacs: @adisbladis
Erlang: @gleber
Go: @kalbasit @Mic92 @zowoq
Haskell: @peti @cdepillabout
Python: @FRidh
Perl: @volth
php: @NixOS/php
Ruby: @alyssais
rust: @bhipple @Mic92 @andir @LnL7

Darwin: @NixOS/darwin-maintainers

bazel: @mboes
blockchains @mmahut
podman: @NixOS/podman
Qt / KDE: @ttuegel
Postgres: @thoughtpolice

Co-release-manager: @worldofpeace

in case I forgot anyone: @NixOS/nixpkgs-committers

If I did forget someone, please cc them. I would like to make sure that everyone was able to voice their concerns and issues.