toString also coerces a set with an outPath attribute to a string
toString also coerces a set with an outPath attribute to a string

nix-repl> builtins.toString { outPath = "somestring"; }
"somestring"

NixOS/nix,rycee/nix,NixOS/nix,rycee/nix,NixOS/nix,rycee/nix,NixOS/nix,rycee/nix,rycee/nix,NixOS/nix