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`string' has the same semantics as in try-completion and all-completions.
(completion-table-with-context, completion--embedded-envvar-table)
(completion--file-name-table, completion-pcm--find-all-completions):
Adjust code accordingly.
* vc-bzr.el (vc-bzr-annotate-time): Reduce memory allocation.
(vc-bzr-revision-completion-table): Handle `boundaries' argument.