Quoting Andrew Berry <andrewbe...@sentex.net>:
<quote reference="http://drupal.org/upgrade/">
1. Upgrade to the latest minor version in the major version you're
currently on (e.g. if you are on 5.5 and want to upgrade to 6.10,
and there is a 5.12 version out, upgrade to 5.12 first).
</quote>
I assume in this case it's so that if there are any API-changing
fixes in the point release, they are more easily dealt with than
during a full upgrade.
Yes, hook_update_N for the current release is not carried forward to
the next major release. So, you might miss something important like a
variable change, a new table column, a new index, or whatever the
change may be if you don't upgrade to the latest point version first.
--
Earnie
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