There were a few changes in that range relevant to the changes you're seeing:

• Strawberry Perl changed from doing an MSVCRT build of perl to UCRT, this is likely the cause of the change in pointer ranges (the addresses in both cases virtual addresses, like pretty much any pointer on a modern OS)
• Richard changed constant folding to allow constant folded strings to be marked Copy-on-Write in 06e421c559c
• I changed pack() to make SVs used for the pack "p" template non-CoW in more cases in 3d831e8998d, since we documented modifying SVs through the pointers pack() produces.

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