
The length check was introduced[0] to match systemd's max line
length. This limit has been increased[1][2] to 1MiB, starting with
systemd v235.
[0] https://github.com/nixos/nixpkgs/issues/3403
[1] e6dde451a5
(relevant systemd commit)
[2] https://github.com/systemd/systemd/issues/3302
(more context on systemd change)