Fuse stream and direct run calls

[clefourrier]

The code is duplicated here (apart from the return management). It's going to be more robust to have one single function to avoid losing some logic changes.

[aymeric-roucher]

Thank you @clefourrier! I've tried doing this deduplication but I think there's a fundamental incompatibility: whenever there's a yield inside a function, it becomes a generator type, even when the yield is never accessed. If you manage to make it work however it'd be great!

[clefourrier]

I passed it to draft when noticing this - thanks for the confirmation that it's not just me becoming crazy! XD
I'll try to get to the bottom of this 😈

[clefourrier]

Héhéhé :D

[aymeric-roucher]

LGTM! Thanks a lot!

[aymeric-roucher]

When a PR simplifies 50 lines of your core code, thx @clefourrier