text: 'use strict'
  
  module.exports = change
  
  function change(from, to, places, fmt) {
    if ('boolean' === typeof places) fmt = places, places = 2
  
    places = 'number' === typeof places
      ? places
      : 2
  
    from = +from
    to = +to
    if (from !== from || to !== to)
      return 0
  
    if (from === 0) {
      if (to) return Infinity
      if (fmt) {
        return '0.00%'
      }
      return 0
    }
    var o = ((to - from) / from)
    if (fmt) {
      o = o * 100
      o = o.toFixed(places)
      return o + '%'
    }
    return +o
  }
  
  change.format = function(from, to, places) {
    return change(from, to, places, true)
  }
  