start->first in getindex

This happened to work because start returns the same thing as first for our two OrdinalRange types in base, but it's not guaranteed for all possible OrdinalRange types.

base/twiceprecision.jl

@@ -210,7 +210,7 @@ function getindex{T}(r::StepRangeLen{T,<:TwicePrecision,<:TwicePrecision}, s::Or
     @boundscheck checkbounds(r, s)
     soffset = 1 + round(Int, (r.offset - first(s))/step(s))
     soffset = clamp(soffset, 1, length(s))
-    ioffset = start(s) + (soffset-1)*step(s)
+    ioffset = first(s) + (soffset-1)*step(s)
     if step(s) == 1 || length(s) < 2
         newstep = r.step
     else