libclass-mop-perl 1.12-1build1 (i386 binary) in ubuntu precise

 Class::MOP is an implementation of a Meta Object Protocol for the Perl object
 system. It does not change the behavior or characteristics of the classic Perl
 object system, but rather, establishes a protocol for its manipulation and
 introspection. It allows for the creation of a more complex object framework
 such as Moose (see libmoose-perl), which was inspired by Perl 6's modern
 object system.
 .
 Contrary to popular belief, explicit MOP implementations do not always result
 in a performance penalty. In fact, by itself, library does nothing to affect
 your existing code base -- you only pay for the features you use.