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7th chunk of `doc/release-notes/rl-2505.section.md`
200c39e34c984792ef5936c35cddaa30af9ebffd418bf01f0000000100000ffc
- A [policy documenting the details of Go toolchain and builder upgrades](https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/go/README.md#go-toolchainbuilder-upgrade-policy) in nixpkgs, as well as rules related to using non-default builders like `buildGo1xxModule` and `buildGoLatestModule` has been added in-tree.

- top-level `playwright` now refers to the github Microsoft/playwright package
  instead of the python tester launcher. You can still refer to the python
  launcher via `python3Packages.toPythonApplication python3Packages.playwright`

- The representation of the flags attributes as shell/environment variables for most Python building setup hooks are now the same as `stdenv.mkDerivation` and other build helpers -- they are space-separated environment variables when `__structuredAttrs = false` and Bash arrays when `__structuredAttrs = true`, and are concatenated to the command without Bash-evaluation. The following behaviour changes are introduced during the conversion:

  - The following flags are no longer Bash-expanded before concatenated to the command:
    - `disabledTests` and `disabledTestPaths` for `pytestCheckHook`. (`disabledTestPaths` used to be expanded twice before concatenation.)
    - `setupPyBuildFlags` and `setupPyGlobalFlags` for `setuptoolsBuildHook`.

  - `pytestFlags` and `unittestFlags` replace `pytestFlagsArray` and `unittestFlagsArray` and become the new and conforming interface.

  - `pytestFlagsArray` and `unittestFlagsArray` are kept for compatibility purposes. They continue to be Bash-expanded before concatenated. This compatibility layer will be removed in future releases.

- The `haka` package and module has been removed because the package was broken and unmaintained for 9 years.

- The `gsignond` package, plugins and module have been removed because they were unmaintained for 6 years.

- `strawberry` has been updated to 1.2, which drops support for the VLC backend and Qt 5. The `strawberry-qt5` package
  and `withGstreamer`/`withVlc` override options have been removed due to this.

- `nexusmods-app` has been upgraded from version 0.6.3. If you were running a version older than 0.7.0, then before upgrading, you **must reset all app state** (mods, games, settings, etc). Otherwise, NexusMods.App will crash due to app state files incompatibility.
  - Typically, you can can reset to a clean state by running `NexusMods.App uninstall-app`. See Nexus Mod's [how to uninstall the app](https://nexus-mods.github.io/NexusMods.App/users/Uninstall) documentation for more detail and alternative methods.
  - This should not be necessary going forward, because loading app state from 0.7.0 or newer is now supported. This is documented in the [0.7.1 changelog](https://github.com/Nexus-Mods/NexusMods.App/releases/tag/v0.7.1).

- `nezha` and its agent `nezha-agent` have been updated to v1, which contains breaking changes. See the [official wiki](https://nezha.wiki/en_US/) for more details.

- `ps3-disc-dumper` was updated to 4.2.5, which removed the CLI project and now exclusively offers the GUI

- `kmonad` is now hardened by default using common `systemd` settings.
  If KMonad is used to execute shell commands, hardening may make some of them fail.  In that case, you can disable hardening using {option}`services.kmonad.keyboards.<name>.enableHardening` option.

- `isd` was updated from 0.2.0 to 0.5.1, the new version may crash with a previously generated config, try moving or deleting `~/.config/isd/schema.json`.

- `uwsgi` no longer supports Python 2 plugins.

- Support for CUDA 10 has been dropped, as announced in the 24.11 release notes.

- `mepo` was updated to version 1.3.3.  The manual page was removed,
  a new JSON API was introduced to replace Mepolang for configuration,
  and a few default key bindings were changed.
  See the [1.3.0 changelog](https://git.sr.ht/~mil/mepo/refs/1.3.0)
  for more details.

- `mkBinaryCache` now defaults to using `zstd` compression for the binary caches it creates. The previous `xz` compression method can be used by passing `compression = "xz";`.
Title: Nixpkgs 25.05: Package Updates, Removals, and Build System Changes (Part 4)
Summary
This chunk continues detailing package updates, removals, and build system changes in Nixpkgs 25.05. It includes: Documentation of Go toolchain upgrades, changes to the top-level `playwright` package, updates to Python building setup hooks, removal of `haka` and `gsignond`, `strawberry` update dropping VLC and Qt 5 support, `nexusmods-app` upgrade requiring app state reset, `nezha` update with breaking changes, `ps3-disc-dumper` update removing the CLI, `kmonad` hardening, `isd` update with potential config incompatibility, `uwsgi` dropping Python 2 support, removal of CUDA 10 support, `mepo` update with manual page removal and API changes, and `mkBinaryCache` defaulting to zstd compression.