1], ['foo'], ], [ ['foo' => 2, 'bar' => 1, 'baz' => 5], ['foo', 'bar', 'baz', 'foo', 'baz', 'baz', 'baz', 'baz'], ], [ ['foo' => 2, 'bar' => 1, 'baz' => 5], Collection\Vector::fromArray(['foo', 'bar', 'baz', 'foo', 'baz', 'baz', 'baz', 'baz']), ], [ ['foo' => 2, 'bar' => 1, 'baz' => 4], Vec\concat( ['foo', 'bar', 'baz'], ['foo'], ['baz'], ['baz', 'baz'], ), ], ]; } }