Handle for monkey-patched functions
Monkey::Patch::Handle keeps a stack of subroutine references for each name (Foo::bar::baz type name), so that the coderef that lives at that name is always the top of the stack, and if the wrappers get uninstalled in a funky order all hell doesn't break loose.
You should never need to use this directly, so read L(Monkey::Patch) instead.