Generalize BraidingTensor promotion

Author: lkdvos

src/tensors/braidingtensor.jl

@@ -31,13 +31,19 @@ end
 function BraidingTensor{T}(V1::S, V2::S, adjoint::Bool=false) where {T,S<:IndexSpace}
     return BraidingTensor{T,S}(V1, V2, adjoint)
 end
+function BraidingTensor{T}(V1::IndexSpace, V2::IndexSpace, adjoint::Bool=false) where {T}
+    return BraidingTensor{T}(promote(V1, V2)..., adjoint)
+end
 function BraidingTensor(V1::S, V2::S, adjoint::Bool=false) where {S<:IndexSpace}
     if BraidingStyle(sectortype(S)) isa SymmetricBraiding
         return BraidingTensor{Float64,S}(V1, V2, adjoint)
     else
         return BraidingTensor{ComplexF64,S}(V1, V2, adjoint)
     end
 end
+function BraidingTensor(V1::IndexSpace, V2::IndexSpace, adjoint::Bool=false)
+    return BraidingTensor(promote(V1, V2)..., adjoint)
+end
 function BraidingTensor(V::HomSpace, adjoint::Bool=false)
     domain(V) == reverse(codomain(V)) ||
         throw(SpaceMismatch("Cannot define a braiding on $V"))