Given an array of non-negative integers, find a non-empty contiguous subarray whose XOR is maximum and return its boundaries as [start, end] using 0-indexed inclusive positions. If several subarrays achieve the maximum XOR, return the one with the smallest start index, breaking further ties by the smallest end index.
Input: A JSON object {"arr": [<non-negative integers>]}.
Output: Return [start, end] of a maximum-XOR subarray under the stated tie-breaking.
Input: {"arr":[1,2,3,4]}
Output: [2,3]
Explanation: The maximum XOR 7 comes from indices 2..3.Input: {"arr":[4,1,1]}
Output: [0,1]
Explanation: The single element 4 is the maximum -> [0,0].1 <= len(arr) <= 2 * 10^30 <= arr[i] < 2^20