Fix fpsort! for non Int indices (#43934)

* Extend allowsmissing and ismissing to Integer

* Test #43925

Author: LilithHafner

base/sort.jl

@@ -1146,10 +1146,10 @@ isnan(o::Perm, i::Integer) = isnan(o.order,o.data[i])
 
 ismissing(o::DirectOrdering, x::Floats) = false
 ismissing(o::DirectOrdering, x::Missing) = true
-ismissing(o::Perm, i::Int) = ismissing(o.order,o.data[i])
+ismissing(o::Perm, i::Integer) = ismissing(o.order,o.data[i])
 
 allowsmissing(::AbstractVector{T}, ::DirectOrdering) where {T} = T >: Missing
-allowsmissing(::AbstractVector{Int},
+allowsmissing(::AbstractVector{<:Integer},
               ::Perm{<:DirectOrdering,<:AbstractVector{T}}) where {T} =
     T >: Missing
 

test/sorting.jl

@@ -49,6 +49,7 @@ end
     end
     @test_throws ArgumentError sortperm!(view([1,2,3,4], 1:4), [2,3,1])
     @test sortperm(OffsetVector([8.0,-2.0,0.5], -4)) == OffsetVector([-2, -1, -3], -4)
+    @test sortperm!(Int32[1,2], [2.0, 1.0]) == Int32[2, 1]
 end
 
 @testset "misc sorting" begin