Description:
------------
When creating a \DateInterval()-object according to the documentation the 'days'-property should be false. A var_dump on the object confirms this.
Now if you do a var_dump directly on the 'days'-property the var-type and -value changes from FALSE to -99999.
https://bugs.php.net/bug.php?id=65654 might be related to this.

Test script:
---------------
$test = new \DateInterval('P1D');

var_dump($test->days);

Expected result:
----------------
bool(false)

Actual result:
--------------
int(-99999)