function isBuffer(obj) {
	  return !!(obj != null &&
	    (obj._isBuffer || // For Safari 5-7 (missing Object.prototype.constructor)
	      (obj.constructor &&
	      typeof obj.constructor.isBuffer === 'function' &&
	      obj.constructor.isBuffer(obj))
	    ))
	}
Return the type of `val`.

@param {Mixed} val
@return {String}
@api public