Fix maketerm when symtype is array

Author: bowenszhu

src/types.jl

@@ -563,17 +563,18 @@ function TermInterface.maketerm(T::Type{<:BasicSymbolic}, head, args, metadata)
     # Where the result would have a symtype of Bool. 
     # Please see discussion in https://github.com/JuliaSymbolics/SymbolicUtils.jl/pull/609 
     # TODO this should be optimized.
-    new_st = if pst === Bool 
-        pst 
-    elseif pst === Any || (st === Number && pst <: st) 
+    new_st = if st <: AbstractArray
         st
-    else 
-        pst 
-    end 
+    elseif pst === Bool
+        pst
+    elseif pst === Any || (st === Number && pst <: st)
+        st
+    else
+        pst
+    end
     basicsymbolic(head, args, new_st, metadata)
 end
 
-
 function basicsymbolic(f, args, stype, metadata)
     if f isa Symbol
         error("$f must not be a Symbol")