Classes generated for union involving a typedef of boolean fail

If you typedef a boolean:

typedef is-present

{ type boolean; }

grouping vlan-id-attributes {
leaf vlan-id {
type union

{ type match:is-present; type l2t:vlan-id; }

}
}

Results in:

[ERROR] symbol: method getValue()
[ERROR] location: variable _isPresent of type IsPresent
[ERROR] /Users/hagbard/try/controller/opendaylight/md-sal/model/model-flow-base/src/main/yang-gen-sal/org/opendaylight/yang/gen/v1/urn/opendaylight/model/match/types/rev131026/VlanIdAttributes.java:[40,36] error: cannot find symbol
[ERROR] -> [Help 1]

It appears that there is a built in call to getValue, but boolean provides isValue.