Tests/Docs after "stricter explicit conversion from Literals to Integers"

test/libsolidity/semanticTests/array/storage_array_ref.sol

@@ -15,7 +15,7 @@ contract BinarySearch {
         uint256 _value
     ) private returns (uint256 o_position) {
         if (_len == 0 || (_len == 1 && _data[_begin] != _value))
-            return uint256(-1); // failure
+            return type(uint256).max; // failure
         uint256 halfLen = _len / 2;
         uint256 v = _data[_begin + halfLen];
         if (_value < v) return find(_data, _begin, halfLen, _value);