Proper parametric type for CompositeBasis

src/bases.jl

@@ -71,11 +71,11 @@ Stores the subbases in a vector and creates the shape vector directly
 from the shape vectors of these subbases. Instead of creating a CompositeBasis
 directly `tensor(b1, b2...)` or `b1 ⊗ b2 ⊗ …` can be used.
 """
-mutable struct CompositeBasis{B<:Basis} <: Basis
+mutable struct CompositeBasis{B<:Vector{Basis}} <: Basis
     shape::Vector{Int}
-    bases::Vector{B}
+    bases::B
 end
-CompositeBasis(bases::Vector{B}) where B<:Basis = CompositeBasis{B}(Int[prod(b.shape) for b in bases], bases)
+CompositeBasis(bases::B) where B<:Vector{Basis} = CompositeBasis{B}(Int[prod(b.shape) for b in bases], bases)
 CompositeBasis(bases::Basis...) = CompositeBasis(Basis[bases...])
 
 ==(b1::CompositeBasis, b2::CompositeBasis) = equal_shape(b1.shape, b2.shape) && equal_bases(b1.bases, b2.bases)