[Feature Request] Range arithmetic

As the recent issues point out, the Ranges are tricky with floats as spacing. It'd be nice to be able to do arithmetic on Ranges, so that we can have Ranges generated from integers and multiplied by the required spacing later on. Something like this

// Go from 0 to 1 in N+1 steps
var N = 10
var range = 0..N // I think this is always exact?
range = range/N // This operation, if possible, would give a Range going from 0 to 1 exactly in N+1 steps, without worrying about floating point.

Alternatively or additionally, we could have a different kind of Range object going from a to b in a fixed number of steps (like NumPy's linspace), may be with the notation a..b::N or something?

The issue does not name implementation files, tests, or entry points. Start by locating the Range implementation and reviewing the discussion around floating-point spacing. Before coding, determine whether arithmetic on existing Ranges, a fixed-step linspace-style object, or both is intended, then define tests that establish exact endpoints and step counts.