The method World::step(&mut self, dt: N)
takes a Scalar
value as dt
, which I take to mean elapsed time. My question is about what kind of scale this value has, and what it’s normal values would be. In my mind, there are three possibilities:

1.0
is equal to 1 second 
1.0
is the largest step possible 
1.0
is some ‘standard’ step duration, which is documented elsewhere, or common knowledge in the field.
Also, if this is documented somewhere else, and I have missed it, please don’t hesitate to just link me to relevant documentation. Sometimes knowing where to look is better than just knowing the answer.
Thanks for your time.