code: function isBuffer(obj) {
  	  return obj != null && (!!obj._isBuffer || isFastBuffer(obj) || isSlowBuffer(obj))
  	}
docs: the following is from is-buffer, also by Feross Aboukhadijeh and with same lisence The _isBuffer check is for Safari 5-7 support, because it's missing Object.prototype.constructor. Remove this eventually