When @Dmitriy said:
It didn’t really register with me that this would include button widgets, but it seems that this is the case and is causing a few issues for Node-Red users:
It’s easy enough to work around, but a bit of an inconvenience. I don’t know if the issue of a button widget not accepting 0.0 as an Off command is a peculiarity of the Node-Red implementation, or a bug in the latest Android release. I don’t have an Android device to test this on, but if passing a float value of 0.0 to a button widget from code doesn’t turn it off then it may catch some non Node-Red users out.
I’m still not clear why a switch widget with a binary state need the ability to use floats though!
Pete.