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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Parameter substitution in the union type does not work with typing.Union","articleBody":"BPO | [44653](https://bugs.python.org/issue44653)\n--- | :---\nNosy | @gvanrossum, @ambv, @serhiy-storchaka, @miss-islington, @uriyyo, @Fidget-Spinner\nPRs | \u003cli\u003epython/cpython#27232\u003c/li\u003e\u003cli\u003epython/cpython#27247\u003c/li\u003e\u003cli\u003epython/cpython#27296\u003c/li\u003e\n\n\u003csup\u003e*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*\u003c/sup\u003e\n\n\u003cdetails\u003e\u003csummary\u003eShow more details\u003c/summary\u003e\u003cp\u003e\n\nGitHub fields:\n```python\nassignee = None\nclosed_at = \u003cDate 2021-07-22.22:21:37.910\u003e\ncreated_at = \u003cDate 2021-07-16.13:32:27.733\u003e\nlabels = ['interpreter-core', 'type-bug', '3.10', '3.11']\ntitle = 'Parameter substitution in the union type does not work with typing.Union'\nupdated_at = \u003cDate 2021-07-22.22:34:04.923\u003e\nuser = 'https://github.com/serhiy-storchaka'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2021-07-22.22:34:04.923\u003e\nactor = 'gvanrossum'\nassignee = 'none'\nclosed = True\nclosed_date = \u003cDate 2021-07-22.22:21:37.910\u003e\ncloser = 'lukasz.langa'\ncomponents = ['Interpreter Core']\ncreation = \u003cDate 2021-07-16.13:32:27.733\u003e\ncreator = 'serhiy.storchaka'\ndependencies = []\nfiles = []\nhgrepos = []\nissue_num = 44653\nkeywords = ['patch']\nmessage_count = 8.0\nmessages = ['397624', '397803', '397827', '397828', '398009', '398011', '398012', '398014']\nnosy_count = 6.0\nnosy_names = ['gvanrossum', 'lukasz.langa', 'serhiy.storchaka', 'miss-islington', 'uriyyo', 'kj']\npr_nums = ['27232', '27247', '27296']\npriority = 'normal'\nresolution = 'fixed'\nstage = 'resolved'\nstatus = 'closed'\nsuperseder = None\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue44653'\nversions = ['Python 3.10', 'Python 3.11']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/serhiy-storchaka","@type":"Person","name":"serhiy-storchaka"},"datePublished":"2021-07-16T13:32:28.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/88819/cpython/issues/88819"}