Function object argument type is incompatible with default

[schibrikov]

The thing is when you have an object function argument and specify a default value for it's property with complex type, Flow doesn't recognize type properly.

It may be hard to explain, just check this example: Example

For example, I can't create a function, which accepts object with property that can be either an array of functions or a single function.

For those who want a quick look:

type MyType = number[] | number;

function myfunc({
  // Here flow screams that default arg is incompatible with number (WTF?)
  arg = 3,
}: { arg: MyType }) {
  console.log(arg);
}

[schibrikov]

bump! Still reproducible in 0.9X. Can someone explain why is this happens?

[goodmind]

Duplicate of #2093