code: function isBlob(obj) {
  		return typeof obj === 'object' &&
  				typeof obj.arrayBuffer === 'function' &&
  				typeof obj.type === 'string' &&
  				typeof obj.stream === 'function' &&
  				typeof obj.constructor === 'function' &&
  				typeof obj.constructor.name === 'string' &&
  				/^(Blob|File)$/.test(obj.constructor.name) &&
  				/^(Blob|File)$/.test(obj[Symbol.toStringTag])
  }
docs: Check if `obj` is a W3C `Blob` object (which `File` inherits from)
  @param  {*} obj
  @return {boolean}