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			this morning's headache is that Twitter's favicon is served with a "vnd.microsoft.icon" mime type, an .ico extension, but is actually a png
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			i'm sure they've got a good reason for it
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			there we go, the good reason: @cooperx86/1540255970797953024 (ironically, i think the library i am using is able to handle icos with png data inside, but not icos-that-are-actually-just-pngs)