libb-cow-perl - 0.007-1+b2 main

B::COW provides some naive additional B helpers to check the COW status of
one SvPV.
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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).
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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.
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One SV can then drop the COW flag when it's the only one holding a pointer to
the PV.
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The COWREFCNT is stored at the end of the PV, after the "\0".
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That value is limited to 255, after that a new PV would be created,