Choose Mouse or Moose based on the which the current class is using.

[schwern]

Any::Moose will use Moose if anything loads Moose. This has two problems for MS. First, Moose is slower than Mouse. Second, even if your class is using Mouse, MS will use Moose.

Method::Signatures should choose to resolve types using Moose IF AND ONLY IF the current package is using Moose. For everything else, use Mouse.

Another issue will cover a swith to explicitly control which is being used.

[schwern]

Now there's Moo types as well.