reverse of an unsigned range does not work as expected

[simonschoelly]

If you reverse a range of unsigned integers, then you get an empty range:

julia> reverse(Int8(1):Int8(5)) |> collect
5-element Array{Int8,1}:
 5
 4
 3
 2
 1

julia> reverse(UInt8(1):UInt8(5)) |> collect
0-element Array{UInt8,1}

Maybe this is intentional but it is not what one (I) would expect.
The problem seems to be that by reversing we get a StepRange

julia> reverse(UInt8(1):UInt8(5))
0x05:0xff:0x04

and apparently there is a check for an overflow here, so the values never get wrapped around through 2-complement.

versioninfo:

julia> versioninfo()
Julia Version 1.0.1
Commit 0d713926f8 (2018-09-29 19:05 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-6.0.0 (ORCJIT, skylake)
Environment:
  JULIA_EDITOR = gvim

[StefanKarpinski]

Hah, nice bug.