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Not a leak, a feature of Test::Builder ;-) (Score:1)
I don't believe there's a serious leak anywhere in your 21_exhaustive.t (with or without Test::More), at least that's what valgrind tells me.
I suspect the primary cause of the memory growth you're seeing is a feature (not a leak) of Test::Builder. If you peek at the implementation of Test->ok() in Builder.pm, you'll see it stores information about each test executed, so that it can do its reporting at the end. Storing this information seems to consume around 500 bytes per test.
I stumbled across a similar problem [perlmonks.org] a while back.
/-\
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