/**
* Union join the values of one or more with this Seq and return a new Seq
* @param array $arrayLikeN An array of transversable
* @return Seq
*/
public function union(...$arrayLikeN)
{
$output = [$this->hash];
foreach ($arrayLikeN as $arg => $value) {
$output[] = __PRIVATE__::traversableToArray(__CONTRACT__::argIsATraversable($value, $arg));
}
return static::from(call_user_func_array('array_merge', $output));
}
/**
* @covers ::isNonEmpty
* @dataProvider emptyCountableProvider
*/
public function test_isNonEmpty_contract($empty)
{
$this->expectException(invalidSizeException::class);
contract::isNonEmpty($empty);
}