In bleed, I see I32 in pp_substr: 

I32 pos;
I32 rem;
I32 fail;

[download]

It doesn't take much imagination to figure out how those vars are surely used. Right off the bat, one of the args is placed in pos: 

pos = POPi;

[download]

In reply to Re^3: PV limits on 64-bit perls? by ikegami
in thread PV limits on 64-bit perls? by BrowserUk

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