'include' paramater doesn't work for groups

With latest WordPress (3.3.1 and 3.4-alpha). The paramater works for individual fields but not for groups

Start by reproducing the reported difference between the include parameter on individual fields and on groups using WordPress 3.3.1 or 3.4-alpha. Trace how include is handled for both cases, and consider the issue done when group fields honor the parameter without breaking individual-field behavior, with a regression check for both paths.

Written by the indexing model from the issue text.