Add type declaration to reduce ambiguity

src/hssg/artifacts/html.lisp

@@ -70,6 +70,7 @@
                (node (plump:make-element
                        parent (normalize tag)
                        :children (plump:make-child-array (length tail)))))
+          (declare (type list tail))
           (set-attributes node attributes)
           ;; Children will be automatically added to NODE as a side effect
           (loop for child in tail when child do (sexp->plump-tree child node))