Sergei ZimmermanandEmily b6d5670bcf libexpr: Canonicalize TOML timestamps for toml11 > 4.0
This addresses several changes from toml11 4.0 bump in
nixpkgs [1].

1. Added more regression tests for timestamp formats.
   Special attention needs to be paid to the precision
   of the subsecond range for local-time. Prior versions select the closest
   (upwards) multiple of 3 with a hard cap of 9 digits.

2. Normalize local datetime and offset datetime to always
   use the uppercase separator `T`. This is actually the issue
   surfaced in [2]. This canonicalization is basically a requirement
   by (a certain reading) of rfc3339 section 5.6 [3].

3. If using toml11 >= 4.0 also keep the old behavior wrt
   to the number of digits used for subsecond part of the local-time.

[1]: https://www.github.com/NixOS/nixpkgs/pull/331649
[2]: https://www.github.com/NixOS/nix/issues/11441
[3]: https://datatracker.ietf.org/doc/html/rfc3339

(cherry picked from commit dc769d72cb8ad22a0f89768682b5499a9d2b3d8b)
Upstream-PR: https://github.com/NixOS/nix/pull/13741
Change-Id: Iac4fbe5108be79be585e9670fa42dfd11f3c5e89
(cherry picked from commit 2898b9e7dc)
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Lix

Lix is an implementation of Nix, a powerful package management system for Linux and other Unix systems that makes package management reliable and reproducible.

Read more about us at https://lix.systems.

Installation

On Linux and macOS the easiest way to install Lix is to run the following shell command (as a user other than root):

$ curl -sSf -L https://install.lix.systems/lix | sh -s -- install

For systems that already have a Nix implementation installed, such as NixOS systems, read our install page

Building And Developing

See our Hacking guide in our manual for instruction on how to set up a development environment and build Lix from source.

Additional Resources

License

Lix is released under LGPL-2.1-or-later.

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