That's a lot of extra lexicals that aren't being used in the closure. Does it carry them around?

The long and the short of it is 'no'. A closure will only store the lexical variables in its lexical pad that are referenced within the subroutine. As Abigail-II's code aptly demonstrates $name's DESTROY method is called upon the exit of make_accessor() (which is its immediate lexical scope) and therefore wasn't held in the closure created.
HTH

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broquaint

update: added clarification