Typedefs are ignoring `@extends` JSDoc

[Antriel]

E.g. phaser.GraphicsOptions should include types from phaser.GraphicsStyles.

[Antriel]

Superb, just a small issue: duplicate fields are kept, they should be merged (and their types technically union-ed if different, but we can just use Dynamic, assuming they are different in the first place). E.g. phaser.JSONGameObject.name.

[sebbernery]

It seems better now, but I still don't unionize types if they are differents (there is no case here, but it can be different in a next version ?)

[Antriel]

Could happen, although seems unlikely. Maybe with two different configs using Int and Number for the same field. Typing that to Dynamic, if that's the case, will suffice. But if you want it perfect, it could be done using haxe.extern.EitherType, although it doesn't feel too important.