Nix/doc/manual/rl-next/leading-period.md

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Store paths are allowed to start with `.` 912 9867 9091 9095 9120 9121 9122 9130 9219 9224

Leading periods were allowed by accident in Nix 2.4. The Nix team has considered this to be a bug, but this behavior has since been relied on by users, leading to unnecessary difficulties. From now on, leading periods are officially, definitively supported. The names . and .. are disallowed, as well as those starting with .- or ..-.

Nix versions that denied leading periods are documented in the issue.