Alphanumeric Item Name

invalid item name ‘3D_Printer_Power’
Is this a bug or expected behavior? It would not allow me to have a number first.
I am running 3.4.0.

It has always been true that an item name cannot start with a number. It has only been recently that enforcement of this has been added to the interface.

That was what I expected to hear. Thank you for the quick response.