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Precedence: bulk

> If you don't do it in the core but in the gerber exporter (which is imo 
> much simpler), you need to build the same catalogue, but only once, when 
> you start, and you don't need to delete from it ever, just delete the 
> whole thing at the end of the export. So no reference counting, just an 
> index of shapes alerady seen. Probably something like this is already 
> happening for line widths and/or hole sizes.

For me implementing it in the exporter seems to be the correct place for it.

I discovered several times that functions called only once is equally hard to implement as functions called regularly. I also discovered several times smaller components actually could be more expensive.