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If you turn on the "strict_isolation" parameter in Bugzilla, you
will *not* be able to add any user to the CC field (or set them
-as an Asignee or QA Contact) unless that user could normally see
+as an Assignee or QA Contact) unless that user could normally see
the bug. That is, you will no longer be able to "accidentally"
(or intentionally) give somebody access to a bug that they
otherwise couldn't see.