What version are you seeing this in? I seem to vaguely recall a similar issue a while back that was fixed...
Andrew Wells wrote:
It may be need to change either the implementation of Key::new(Text row), or change the way Range::exact(Text row) matches Trace on Key::new(Text row) line: 102 line: 75 Trace on Range exact(Text row) line 656 line 82 line 123 This causes Range exact(Text row) to never match
