Some generated clauses can never match

[wodow]

Compiling the library results in ~40 warnings like:

warning: this clause cannot match because a previous clause at line 109 always matches
  lib/domainatrex.ex:88

warning: this clause cannot match because a previous clause at line 109 always matches
  lib/domainatrex.ex:88

warning: this clause cannot match because a previous clause at line 109 always matches
  lib/domainatrex.ex:88

I'm not yet sure how to determine which entries in the PSL cause these or whether it's a problem.