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				B::COW provides some naive additional B helpers to check the COW status of one
				SvPV.

				A COWed SvPV is sharing its string (the PV) with other SvPVs. It's a (kind of)
				Read Only C string, that would be Copied On Write (COW). More than one SV can
				share the same PV, but when one PV need to alter it, it would perform a copy of
				it, decrease the COWREFCNT counter. One SV can then drop the COW flag when it's
				the only one holding a pointer to the PV. The COWREFCNT is stored at the end of
				the PV, after the the "\0". That value is limited to 255, when we reach 255, a
				new PV would be created,

				WWW: https://metacpan.org/release/B-COW