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1b1ed1a
(Get the code!)
I guess there are a couple of options for things we can do with this.
One option would be to allow any string to be a reference designator. This would be the ideal solution in my opinion. However, it may break compatibility with the current interaction between gschem and pcb.
Another alternative is to prohibit reference designators that are strings of one or more lower case letters. This strikes me as more of a cludge, but, keeps everything playing nicely together. We would have to apply this check in a lot of places though... off the top of my head: Loading pcb files, loading netlists, adding elements to the layout, changing the designator text of an element...
Unfortunately, I think the second solution is the more likely one for now.