Sprite add metadata field

What’s your good opinion on this
https://github.com/BabylonJS/Babylon.js/issues/12492

Do you want to add a metadata field on each sprite? You can already do it because it is allowed by Javascript

In the case of typescript, an error will be reported. It would be better if sprite’s class could add fields

you can easily extend the interface in typescript with interface augmentation or you could also inherit from the class to add your own fields ?