Hide edge labels in vis.js-network

I would like to simply show/hide the labels of the edges of my vis.js-network – is this possible?

I have tried to update the edges in the vis.js-data structure:

• Delete the label property – doesn’t work
• Set the label to undefined – doesn’t work
• Set the label to '' – doesn’t work
• Set the label to ' ' – works

I would prefer a network-wise toggle of some kind, but I haven’t found one.

Is there a better way of doing this?