One of the problems we met is solved by commit 44fdac69eb864125b4d02af0c650ce735dcf7aa8.
Also there are many uses of shm/pkg_str_dup() where the src is not NULL checked right
before doing the dup (probably NULL check is done on higher levels but some mistakes might
happen).
I think you are right with setting dst->s=NULL only if src->s == NULL. Updated the
pull request to respect this.
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