MarkupInterface should extend \Stringable

This seems valid and correct. Will let committers decide.

So this is good, but there ought to be some places we can change type hints from string|MarkupInterface to string|Stringable in core too? I think we should open a plan issue to discuss. That doesn't detract from adding the interface to MarkupInterface itself so it can be passed to methods that already type hint string|Stringable.

Adding tag for #6

Opened 🌱 Change type hints from string|MarkupInterface to string|Stringable Active .

Committed 17aefff and pushed to 10.1.x. Thanks!

🙏 Yay! This has gotten in the way for me before — this would've made that painless instead of painful 😊

Automatically closed - issue fixed for 2 weeks with no activity.