The maintainer's 2012 response at https://github.com/Test-More/test-more/issues/252 says:

"Test::Builder (what Test::More is on top of) retains test history for the Test::Builder->details method, so that's expected if not always desired behavior. There is currently no way to turn this off.

Test::Builder 1.5 will not retain complete history by default, only statistics, and memory usage will remain flat."

(Italics mine.)

According to Test::More in serious need of review, be afraid!, Test::Builder is about to be deprecated as part of a wholesale rewrite of Test-*.

Does the new setup suffer the same problems?