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Guard against possible memory allocation botch in batchmemtuples().
Negative availMemLessRefund would be problematic. It's not entirelyclear whether the case can be hit in the code as it stands, but thisseems like good future-proofing in any case. While we're at it,insist that the value be not merely positive but not tiny, so as toavoid doing a lot of repalloc work for little gain.Peter GeogheganDiscussion: <CAM3SWZRVkuUB68DbAkgw=532gW0f+fofKueAMsY7hVYi68MuYQ@mail.gmail.com>1 parentcdc7059 commitf032722
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