I'm profoundly unconvinced by this. "Handle special cases, then do the thing" is such a widespread, nigh-universal pattern that I don't think it hides anything from the programmer. It's the pattern used by any function that checks its inputs!
Rejiggering an algorithm so as not to have special cases just puts cognitive load on whoever reads the code to suss out what the original algorithm was. "Why does this algorithm require its input array to be padded with zeroes? Oh I see, it doesn't - the developer just did that to remove some if statements."
Rejiggering an algorithm so as not to have special cases just puts cognitive load on whoever reads the code to suss out what the original algorithm was. "Why does this algorithm require its input array to be padded with zeroes? Oh I see, it doesn't - the developer just did that to remove some if statements."