{"input":[[-5,-3,-1,0,2,4,6],0],"expected":3,"label":"Sorted mixed: 0 is at index 3"}
{"input":[[1],1],"expected":0,"label":"Single element found at 0"}
{"input":[[1],2],"expected":-1,"label":"Single element not found → -1"}
{"input":[[1,3,5,7,9,11,13,15,17,19],7],"expected":3,"label":"Odd-only sorted, 7 at index 3"}
{"input":[[1,3,5,7,9,11,13,15,17,19],6],"expected":-1,"label":"Even target not in odd array → -1"}
