fix promotion of diagonal integer matrix to non-integer power

[fredrikekre]

julia> A = [1 0; 0 2];

julia> A^2.5
ERROR: InexactError: convert(Int64, 5.656854249492381)
Stacktrace:
 [1] convert at ./float.jl:703 [inlined]
 [2] setindex! at ./array.jl:802 [inlined]
 [3] ^(::Array{Int64,2}, ::Float64) at ./linalg/dense.jl:410

[andreasnoack]

You can use copy_oftype(A, TT) here.

[fredrikekre]

spawn failure on macOS

Error in testset spawn:
Error During Test
  Got an exception of type LoadError outside of a @test
  LoadError: InterruptException:
  while loading /private/tmp/julia/share/julia/test/spawn.jl, in expression starting on line 73
ERROR: LoadError: Test run finished with errors
while loading /private/tmp/julia/share/julia/test/runtests.jl, in expression starting on line 29