Fix some ext/date return types

[kocsismate]

No description provided.

[VincentLanglet]

Thanks @kocsismate, does it means the snippet https://3v4l.org/IZXbp will be fixed in 8.3.9 version ?

[kocsismate]

@VincentLanglet No, it won't. I deliberately only fixed this in master, because the change has a slight BC impact: anyone extending these methods has to adapt the return types because the return type became more narrow.

[VincentLanglet]

Thanks, so if I understand correctly, it will be in 8.4 ?

[kocsismate]

Yes, it will!