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This PR supersedes #98. It was easier to rewrite the PR than to merge and resolve with master after #99.
This PR touches on a couple of related issues.
First, I was unable to reproduce the bug as described in #78. Perhaps In any case, I have a regression test that ensures the desired behavior.
Second, I made some changes that allow populations to be retrieved by database cross-reference, as described in #77.
Closes #77. Closes #78.