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# perl -MO=Concise -e '$s = "a" x 3'; 8 <@> leave[1 ref] vKP/REFC ->(end) ... 4 <$> const[IV 3] s ->5 - <1> ex-rv2sv sKRM*/1 ->7 6 <#> gvsv[*s] s ->7
# perl -MO=Concise -e '$s = "aaa"'; 6 <@> leave[1 ref] vKP/REFC ->(end) ... 3 <$> const[PV "aaa"] s ->4 - <1> ex-rv2sv sKRM*/1 ->5 4 <#> gvsv[*s] s ->5