Thank you for your hint.

Actually I mixed up the subtypes from Moose::Util::TypeConstraints and from MooseX::Types, like in this previous post.

And it is even mentioned in the man page of Moose::Manual::Types under "type names". See, when rtfm, you have to chose the right one too ..

In reply to Re^2: problem with using subtype from MooseX::Types::NetAddr::IP by lune
in thread problem with using subtype from MooseX::Types::NetAddr::IP by lune

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