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The link definition names are stored in an Array. Arrays have reduce as a method, which seems to be the source of the problem. You can reproduce it with concat or filter or any other Array method, too. I'm no Javascript expert, and I haven't dug far enough into the problem to figure out just why it happens -- especially because it begins working again if you include the optional title for the link -- but you can see for yourself that it affects the base WMD implementation, too, not just SO's version.