* lisp/gnus/gnus-dup.el: Use lexical-binding
(gnus-dup-list-dirty): Add docstring. (gnus-dup-open): Allocate gnus-dup-hashtb more conservatively now that it is no longer an obarray. (gnus-dup-enter-articles): Fix off-by-one error. (gnus-dup-suppress-articles): DRY. For discussion, see thread starting at: https://lists.gnu.org/archive/html/emacs-devel/2019-03/msg00974.html
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