code: function issue(value, fromIndex) {
    var index = fromIndex
    var length = value.length
  
    while (index < length) {
      if (!decimal(value.charCodeAt(index))) {
        break
      }
  
      index++
    }
  
    if (index - fromIndex === 0) {
      return -1
    }
  
    return index
  }
docs: /* Get the end of an issue which starts at character
  `fromIndex` in `value`.