constraint has a coercion defined. If it doesn't, an error will be thrown
when the attribute is defined. (Dave Rolsky)
++ * has '+foo' now has a blacklist rather than a whitelist for options which
++ can be legally inherited (doy, Tuomas Jormola).
++
[NEW FEATURES]
* We no longer unimport strict and warnings when Moose, Moose::Role, or