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# Release X.Y (202?-??-??)
-* `<nix/fetchurl.nix>` now accepts an additional argument `impure` which
- defaults to `false`. If it is set to `true`, the `hash` and `sha256`
- arguments will be ignored and the resulting derivation will have
- `__impure` set to `true`, making it an impure derivation.
-
-* If `builtins.readFile` is called on a file with context, then only the parts
- of that context that appear in the content of the file are retained.
- This avoids a lot of spurious errors where some benign strings end-up having
- a context just because they are read from a store path
- ([#7260](https://github.com/NixOS/nix/pull/7260)).
-
-* Nix can now automatically pick UIDs for builds, removing the need to
- create `nixbld*` user accounts.
-
- See [`auto-allocate-uids`].
-
- [`auto-allocate-uids`]: (../command-ref/conf-file.md#conf-auto-allocate-uids)
-
-* On Linux, Nix can now run builds in a user namespace where the build
- runs as root (UID 0) and has 65,536 UIDs available.
-
- <!-- FIXME: move this to its own section about system features -->
-
- This is primarily useful for running containers such as `systemd-nspawn`
- inside a Nix build. For an example, see [`tests/systemd-nspawn/nix`][nspawn].
-
- [nspawn]: https://github.com/NixOS/nix/blob/67bcb99700a0da1395fa063d7c6586740b304598/tests/systemd-nspawn.nix.
-
- A build can enable this by by setting the derivation attribute:
-
- ```
- requiredSystemFeatures = [ "uid-range" ];
- ```
-
- The `uid-range` [system feature] requires the [`auto-allocate-uids`]
- setting to be enabled.
-
- [system feature]: (../command-ref/conf-file.md#conf-system-features),
-
-* On Linux, Nix has experimental support for running builds inside a
- cgroup.
-
- See [`use-cgroups`](../command-ref/conf-file.md#conf-use-cgroups).
-
-* `nix build --json` now prints some statistics about top-level
- derivations, such as CPU statistics when cgroups are enabled.