{ lib, ... }: let inherit (lib) mkOption types; in { options.examples = mkOption { type = types.lazyAttrsOf (types.unique { message = "We require a single definition, because seeing the whole value at once helps us maintain critical invariants of our system."; } (types.attrsOf types.str)); }; imports = [ { examples.merged = { b = "bee"; }; } { examples.override = lib.mkForce { b = "bee"; }; } ]; config.examples = { merged = { a = "aye"; }; override = { a = "aye"; }; badLazyType = { a = true; }; }; }