view .arcconfig @ 46152:e166e8a035a7

copies-rust: use the entry API to overwrite deleted entry

This is more efficient, more idiomatic and more compact.

The main motivation for this change is to cleanup that area before start to do
"overwrite" tracking. Such tracking will ultimately help to avoid costly
is_ancestors call when merging changeset.

Differential Revision: https://phab.mercurial-scm.org/D9494

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