We currently support projections for non multikey indexes, but not multikey indexes. If an index becomes multikey during a yield, we may return results that are not proper projections of actual documents. For example, if {a:[1,2]} is saved during a yield making the index {a:1} multikey we may return {a:1} and {a:2} even though there may not be any documents that should be projected to {a:1} or {a:2}.

This issue affects yielding in both query and get more.

A test demonstrating the issue will be pushed.