What happens when staticBody set mass not equal to zero(with b2Body_SetMassData)?

[HEKEPOIU]

it seems i can set the mass to non-zero for staticbody?
and I check box2d V2 are block that posiblelity(via early return), why v3 allow that happens?

[erincatto]

This seems like an arbitrary choice. I'm wondering why you are setting the mass on a static body.

[HEKEPOIU]

hey! thanks for your reply! I've recently been playing around with some physics code(make a very simple physics engine!), and ran into an issue about staticbody collision, and it seems that set a static body mass to zero(inv_mass to zero) is a common way to make it immovable.
and after that I searched how others handled the staticbody collision issue, and accidentally discovered that.

I think that maybe there is an interesting decision that I don't understand, so I started this discussion!

Thanks for clarifying that for me!