function _bigRangeInc(start, end, step) {
    var array = [];
    var x = start;

    if (step.gt(ZERO)) {
      while (smallerEq(x, end)) {
        array.push(x);
        x = x.plus(step);
      }
    } else if (step.lt(ZERO)) {
      while (largerEq(x, end)) {
        array.push(x);
        x = x.plus(step);
      }
    }

    return array;
  }
Create a range with big numbers. End is included
@param {BigNumber} start
@param {BigNumber} end
@param {BigNumber} step
@returns {Array} range
@private