The nft set backend doesn't support network masks, it works with ranges. Inputs like dead::/64 thus need to be translated to two 'start' and 'end' elements. The 'start' element is the first element in the range (i.e., dead::). The 'stop' element is the first element *past* the range, (dead:0:0100:: in the example). This adds a few test cases.
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