Additional roledefs keys beyond 'hosts' not loading into env

This snippet from the docs doesn’t make the example keys ‘foo’ available to the user via env, only the ‘hosts’ key is subsequently loaded by Fabric (into env.hosts)

from fabric.api import env

env.roledefs = {
    'web': {
        'hosts': ['www1', 'www2', 'www3'],
        'foo': 'bar'
    },
    'dns': {
        'hosts': ['ns1', 'ns2'],
        'foo': 'baz'
    }
}

Documented further on this stackoverlow question

[kynan]

@bitprophet Why has this been closed? The behavior of additional roledef keys hasn’t changed, so is this a “won’t fix”?

[chaimpeck]

This is confusing and I think it should be noted in the documentation that these additional variables are not accessible outside of the roledefs.