`lib.kernel` functions' implementeations are not documented?

Example: https://noogle.dev/f/lib/kernel/freeform/ I understand that the definition is trivial: https://github.com/NixOS/nixpkgs/blob/b1d01cf5ba440f7d253673d106774807f8519fb6/lib/kernel.nix#L27:C14 But still.