function Sequence(params) {
    Transform.call(this, null, params);
  }
Generates data tuples for a specified sequence range of numbers.
@constructor
@param {object} params - The parameters for this operator.
@param {number} params.start - The first number in the sequence.
@param {number} params.stop - The last number (exclusive) in the sequence.
@param {number} [params.step=1] - The step size between numbers in the sequence.