improvement: support for unions #558

Job	Run time
ash-ci / mix deps.get	16s
ash-ci / MIX_ENV=test mix.compile	4m 5s
ash-ci / audit	2m 56s
ash-ci / MIX_ENV=dev mix.compile	2m 52s
ash-ci / mix docs	40s
ash-ci / Deploy docs to GitHub pages.	7s
ash-ci / mix sobelow	37s
ash-ci / mix format --check-formatted	26s
ash-ci / mix spark.cheat_sheets --check	26s
ash-ci / mix credo --strict	27s
ash-ci / mix spark.formatter --check	26s
ash-ci / mix test	1m 9s
ash-ci / mix deps.unlock --check-unused	26s
ash-ci / mix dialyzer	3m 53s
ash-ci / Release	0s
	18m 46s

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