propellor 5.15 released with these changes

  • Improve propellor's MetaTypes implementation to avoid an expontential blowup when several MetaTypes fail to unify. This should result in less memory use by ghc when there's a type error.
  • Avoid OOM when built by ghc 9.2.
  • Thanks to the ghc developers for their assistance, particularly spj and Sam Derbyshire.
  • Remove workaround to ghc using a lot of memory displaying an error message about a property of a host having the wrong number of arguments. This brings back clear error messages in such situations.