1.3.1 - "Panel" data-display="push" not "pushing"
As the subject line says, the "push" is not changing the way it opens. It always uses the default.
I know I must be doing something really, really dumb here but I cannot see it.
EDIT:
Of course a few minutes of doing something else gave me the answer: a data-role="content" is required to get the push to happen.