I can reproduce the memory leak with 5.10.0 as well (MSWin32-x86-multi-thread), but not with 5.10.1 (same system).

Update: Additional info:

perl5101delta mentions the following fix: "A weak reference to a hash would leak. This was affecting DBI [RT #56908]."

In reply to Re: process size and weaken by ikegami
in thread process size and weaken by fng

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