It is not in the list of required modules. But the pod mentions it as an "Optional Prereq", saying that "Installing this will speed up a number of type checks for built-in types."

Ahh, according to this search, it shows up in the recommends list. So apparently Metacpan's reverse dependency list includes recommended, not just required.

In reply to Re: [Metacpan] Dependency vs Reverse Dependency by pryrt
in thread [meta::cpan] Dependency vs Reverse Dependency by LanX

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