https://code.djangoproject.com/ticket/26819?cnum_hist=11&cversion=0
#26819 (Using a ArrayField on Meta.unique_together throws "unhashable type: 'list'" on...
https://mail.python.org/archives/list/yt-users@python.org/thread/X7UFXRU5W7HAQ75P3NNMBPFPCPTYIT5V/
Mailman 3 error info "TypeError: unhashable type: 'list'" with FLASH check point data - yt-users -...
https://codeql.github.com/codeql-standard-libraries/python/semmle/python/types/ClassObject.qll/predicate.ClassObject$ClassObject$unhashable.0.html
unhashable
API documentation for CodeQL