Demo of DataScript 0.10.0 circular entity-ID generation when creating new component entities within transaction

gistfile1.clj

(ns demo.main
  (:require [datascript :as ds]))

(def schema
  {:x/component {:db/valueType :db.type/ref
                 :db/cardinality :db.cardinality/many
                 :db/isComponent true}})

(def conn
  (ds/create-conn schema))

(ds/transact! conn
  [{:db/id 1, :z/completely-different "Z"}
   {:db/id 2, :x/component [{:c/name "C"}]}])

; Doing the following instead also creates a circular reference:
#_
(ds/transact! conn
  [{:db/id 1, :x/component [{:c/name "C"}]}])

(enable-console-print!)
(prn @conn)

; This will print something like:
; #datascript/DB {:schema ...
;                 :datoms
;                 [[1 :z/completely-different "Z" 536870913]
;                  [2 :x/component 2 536870913]
;                  [2 :x/name "C" 536870913]]}