>
> In some cases it might make sense to be able to specify coordinates or
> other rich data:
>
> {image:"foo.png", position:[3,7]}
>
> This argues for making the output document have a type like you
> suggested above, e.g.,
>
>  {t:'image', data:'foo.png', position:[3,7]}


 t for 'type'.  Otherwise it would be hard to handle different message
types:

switch (msg.t) {
case 'stdout':
  ...
case 'stderr':
 ...
}

vs

if (msg.hasOwnProperty('stdout')) {
...

- Alex

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