Trusted authentication doesn't work for Confluence users with uppercase usernames

Trying to use the trusted authentication feature of the Jiraissues macro doesn't work when a user's username is uppercase. JIRA shows the following in its log: quote 2008-01-23 13:59:48,104 INFO STDOUT 2008-01-23 13:59:48,104 ajp-0.0.0.0-6103-8 WARN atlassian.seraph.filter.TrustedApplicationsFilt...