containsAt method
Returns true if key matched the key and index in the MultiKey.
final multiKey = MultiKey([1, 2, 3]);
print(multiKey.containsAt(1, index: 0)); // true;
print(multiKey.containsAt(1, index: 1)); // false;
Implementation
bool containsAt(final dynamic key, { required final int index }) => _keys[index] == key;