[Request] What about adding "RequiredType" validation attribute

[demirmusa]

#346

[dbrizov]

I will do it very soon.

[apilola]

I have a custom attribute that does this exact thing, called "Extends". Would you be okay with me submitting a pull request for that?

[DeepChallengerVR]

I have a custom attribute that does this exact thing, called "Extends". Would you be okay with me submitting a pull request for that?

Please do!

[demirmusa]

That issue already has a pr guys 😁