fixed #9 for D" constructor

Author: chakravala

Project.toml

@@ -1,7 +1,7 @@
 name = "DirectSum"
 uuid = "22fd7b30-a8c0-5bf2-aabe-97783860d07c"
 authors = ["Michael Reed"]
-version = "0.5.9"
+version = "0.5.10"
 
 [deps]
 ComputedFieldTypes = "459fdd68-db75-56b8-8c15-d717a790f88e"

src/DirectSum.jl

@@ -118,7 +118,7 @@ DiagonalForm(s::String) = DiagonalForm(Meta.parse(s).args)
 @pure diagonalform(V::DiagonalForm{N,M,S} where N) where {M,S} = isdual(V) ? SUB(diagonalform_cache[S]) : diagonalform_cache[S]
 const diagonalform_cache = SVector[]
 function DiagonalForm{N,M}(b::SVector{N}) where {N,M}
-    a = isdual(M) ? SUB(b) : b
+    a = dyadmode(M)>0 ? SUB(b) : b
     if a ∈ diagonalform_cache
         DiagonalForm{N,M,findfirst(x->x==a,diagonalform_cache)}()
     else