I've created an issue: http://code.google.com/p/pier/issues/detail?id=131 with an associated fix:

Name: Pier-Security-NickAger.174
Author: NickAger
Time: 21 February 2011, 7:39:09 pm
UUID: 7a2e62e8-276f-452c-8f4e-407f23e52121
Ancestors: Pier-Security-lr.173

Hope that makes sense

Nick