Gradle Zip task to do multiple sub-trees?

We're trying to build up a minorly complicated Zip file in Gradle from multiple filesystem source trees, but no matter how many into specifications we give, it all puts them in the same one. Is this possible to do in Gradle?

build/libs/foo.jar --> foo.jar
bar/*              --> bar/*

We're getting this instead:

build/libs/foo.jar --> bar/foo.jar
bar/*              --> bar/*

Using this:

task installZip(type: Zip, dependsOn: jar) {
    from('build/libs/foo.jar').into('.')
    from('bar').into('bar')
}

Any help would be appreciated.

EDIT: Gradle 1.0-milestone-3