public function testIsNaN()
{
// from js
$this->assertFalse(__u::isNaN(null), 'null not not NaN');
$this->assertFalse(__u::isNaN(0), '0 is not NaN');
$this->assertTrue(__u::isNaN(acos(8)), 'but invalid calculations are');
// extra
$this->assertFalse(__u(null)->isNan(), 'null is not NaN with OO-style call');
$this->assertFalse(__u(0)->isNan(), '0 is not NaN with OO-style call');
$this->assertTrue(__u(acos(8))->isNaN(), 'but invalid calculations are with OO-style call');
// docs
$this->assertFalse(__u::isNaN(null));
$this->assertTrue(__u::isNaN(acos(8)));
}
