fix: properly unwrap constraints & type for list newtypes #1503

Job	Run time
ash-ci / Report Mix Dependencies	9s
ash-ci / audit	39s
ash-ci / MIX_ENV=test mix.compile	2m 38s
ash-ci / mix igniter.upgrade	3s
ash-ci / mix spark.formatter --check	0s
ash-ci / MIX_ENV=dev mix.compile	0s
ash-ci / mix test	0s
ash-ci / mix deps.unlock --check-unused	0s
ash-ci / mix format --check-formatted	-1s
ash-ci / mix ash.codegen --check	-1s
ash-ci / mix spark.cheat_sheets --check	-1s
ash-ci / mix credo --strict	-1s
ash-ci / mix dialyzer	-1s
ash-ci / mix sobelow	-1s
ash-ci / mix docs	0s
ash-ci / NIF ${{ matrix.nif }} - ${{ matrix.job.target }} (${{ matrix.job.os }})	0s
ash-ci / Release	0s
ash-ci / Deploy docs to GitHub pages.	0s
	3m 23s

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