Sorting across different datatypes (#17)

* Update TupleTools.jl

* Update runtests.jl

* fix

Author: putianyi889

src/TupleTools.jl

@@ -250,7 +250,8 @@ end
 _sort(t::Tuple{Any}, lt=isless, by=identity, rev::Bool=false) = t
 _sort(t::Tuple{}, lt=isless, by=identity, rev::Bool=false) = t
 
-function _split(t::NTuple{N}) where N
+function _split(t::Tuple)
+    N = length(t)
     M = N>>1
     ntuple(i->t[i], M), ntuple(i->t[i+M], N-M)
 end

test/runtests.jl

@@ -77,3 +77,5 @@ end
 @test @inferred(TupleTools.diff(())) == ()
 @test @inferred(TupleTools.diff((1, ))) == ()
 @test @inferred(TupleTools.diff((1, 2, 3))) == (1, 1)
+
+@test TupleTools.sort((2,1,3.0)) === (1,2,3.0)