Dave,

Attempt to disable DEFAULT_SHAREKEYS was no more then just attempt to proof my assumptions regrading PL_strtab. I understand its not a good idea for production.

I also not sure shrinking of PL_strtab (even it it's possible) will help. Perl may not release memory to OS, thus copy-on-write will occur.

From what I see in sv.c and util.c Perl doesn't provide any API to dynamically enable/disable DEFAULT_SHAREKEYS for new hashes. :(

Thank you.