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foo(bar 1, key => '2') foo(bar 1, KEY => '2') foo(bar 1, :key => '2') foo(bar 1, { baz: :bat } => '2') foo bar - %i[baz] => '2' foo(bar {} => '2') foo(bar baz {} => '2') foo(bar do end => '2') foo(1, bar {} => '2') foo(1, bar do end => '2')