Loop from/to has inconsistent behaviour

[lesquoyb]

Describe the bug
I noticed some weird behaviours/inconsistency of the loop statement with the syntax from/to

1. When doing a loop from 0 to 0 setting explicitly the step to 1, the loop goes through 0.0, a float, which is inconsistent with all the other cases where the type of the value over which we are iterating depends on those of from, to and step.
2. When doing a loop from 0 to -1 setting explicitly the step to 1, the loop doesn't execute the code inside, which to me makes sense but is inconsistent with the previous example where we go through the loop at least once with the initial value.

To Reproduce
Steps to reproduce the behavior:

1. Run this model:

model bugloopto

experiment a {
	init {
		write "from 0 to 1";
		loop i from:0 to:1 step:1{
			write i;
		}
		
		write "from 0 to 0";
		loop i from:0 to:0 step:1{
			write i;
		}
		
		write "from 0 to -1";
		loop i from:0 to:-1 step:1{
			write i;
		}
	}
}

2. See error

[hqnghi88]

1. it should be mistaken condition or unclear logic somewhere in the cases of process these combination.
2. for me it is consistent to be as current because step is positive 1 so the loop never reach -1, if you change to step:-1, it works.