| http://www.w3.org/ns/prov#value | - Right now, if you have an object which you represent as, say, a blessed Hash, then, according to UNIVERSAL::isa, that object is a HASH. But if you implement, say HASH::foo, a method that only exists in the HASH namespace, then UNIVERSAL:can will not see it, nor will it get called if you do $obj->foo.
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