code: function max (value, length) {
    if (value === null || value === undefined || isNaN(length)) {
      return value
    }
  
    return String.prototype.substring.call(value, 0, length)
  }
docs: Return the `length` first characters of `value`. If `length` is higher
  than the number of characters in value, value is returned as is.
  @param {string} value - The value to shorten
  @param {integer} length - The max number of characers to return
  @returns {string} A string of maximum `length` characters