Features that are completely unlike anything you've implemented before, because a lot of infrastructure needs to get set up to support that one feature, and you may not have time to plan it all out properly.
Alternatively, features that are nearly the same as an existing feature, but have a few significant differences. Either leads to lots of duplicated code, or else a bunch of hacks in the current code to make it also work for this edge case.
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Features that are completely unlike anything you've implemented before, because a lot of infrastructure needs to get set up to support that one feature, and you may not have time to plan it all out properly.
Alternatively, features that are nearly the same as an existing feature, but have a few significant differences. Either leads to lots of duplicated code, or else a bunch of hacks in the current code to make it also work for this edge case.