Yes, they are memory locations and could be more or less useful with a core file. It would take a good knowledge of perl implementation details to make that meaningful. A perl built with -DDEBUGGING is probably a better investment for such an investigation.

You can get the decimal address with print 0 | $ref;, which places $ref in numeric context. Since | acts on bitfields, $ref's target address is coerced into an unsigned integer.