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Dotted/Dashed borders fail on rounded corners in Firefox

I just learned today that a dotted or dashed border will render as solid for the rounded portions (specified by border-radius) in Firefox. There is an open bug for this, but I haven't run across it until just now. So if you're wondering why you can't put a dotted border on that circle in firefox - that's why.

Which looks like this in Firefox (screenshot from v21)

demonstrating the Firefox bug for dotted, rounded borders
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