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I tried enabling the Week Numbers option on my Mini Calendar display, but doing so causes a strange rendering bug. It adds a new unlabeled column on the left of the table, but it doesn't populate that column with the week number links. The entire column goes totally unrendered, in fact, which causes all the day links to be shifted one column to the left.
I'm going to look into a way to fix this, since I need it to work for my site's calendar.