StepRange with float-based quantities should error #552
Description
When dealing with floating-point numbers, StepRangeLen should be used instead of StepRange. However, this is currently allowed:
julia> StepRange(1.0u"m", 1.0u"m", 3.0u"m")
(1.0:1.0:3.0) mI would argue that it should error, like it does for unitless numbers:
julia> StepRange(1.0, 1.0, 3.0)
ERROR: ArgumentError: StepRange should not be used with floating point
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