Does anyone know when DateTime modify() returns false?

[simPod]

#8350

I did not find any example when false can happen. Does anyone know?

[AndrolGenhald]

See also #8454 and #8462, it may be worth asking this at php-src.

[VincentLanglet]

(new DateTime())->modify('potato')

returns false. But yeah, I'm trying to introduce a dynamic return type provider in #8462

[simPod]

So basically when there's some gibberish. Nothing else. Right?

[VincentLanglet]

That's what we try to confirm, but yes.