Allow commands to accept partial json objects

[blink1073]

No description provided.

[afshin]

Good call. This seems uncontroversial to me. Is there any downside?

[blink1073]

I don't see any downside.

[blink1073]

Published commands@1.9.0

[vidartf]

This should probably be update as well then:

lumino/packages/widgets/src/menu.ts

Line 990 in 4030e95

args?: ReadonlyJSONObject;

[vidartf]

Note: I think this might break compilation of command implementor code, if strict null checks are on.

[vidartf]

e.g.

// ...
execute: args => {
  return args['foo'].toString();
}
// ...