Simplify id-literal?, avoid some consing.

src/datomish/db.cljc

@@ -58,7 +58,7 @@
    (->TempId part idx)))
 
 (defn id-literal? [x]
-  (and (instance? TempId x)))
+  (instance? TempId x))
 
 (defprotocol IClock
   (now

src/datomish/transact.cljc

@@ -284,7 +284,9 @@
             report
 
             (and (not= op :db/add)
-                 (not (empty? (filter id-literal? [e a v]))))
+                 (or (id-literal? e)
+                     (id-literal? a)
+                     (id-literal? v)))
             (raise "id-literals are resolved for :db/add only"
                    {:error :transact/syntax
                     :op    entity })