This sounds like a bug in Sleepy. Either you or the OP should report this as a bug on rt.cpan.org.
Falling back to backpan is very much a last resort. You don't know what other code the OP has that relies on WWW::Mechanize.
Also, if you upgrade WWW::Mechanize after installing WWW::Mechanize::Sleepy, do you get any operational failures, or was it just the tests that needed 0.58?
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My friends all rate Windows, I must disagree.
Your powers of persuasion will set them all free,
So oh Lord, won’t you burn me a Knoppix CD ?
(Missquoting Janis Joplin)
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