Description:
------------
var_export(), get_object_vars(), and ReflectionObject do not recognize or handle object properties correctly that are coerced from a numerically indexed array or an array with string keys of any integer except for zero.

ie: (object)array(1,2,3,4);
ie: (object)array('1' => 1, '-5' => 2, '3' => 3, '-10' => 4);

Values seem to have no effect. There may be other functions/classes that do not handle these types of property names correctly. The samples included only show the results of ReflectionObject::getProperties(), but also functions like ReflectionObject::hasProperty() incorrectly returns false, for example.

Reproduce code:
---------------
<?php
$a = (object)array(1, 2, 3, 4);
echo '<pre>';
var_dump($a);
print_r($a);
var_export($a);
print_r(get_object_vars($a));
$r = new ReflectionObject($a);
print_r($r->getProperties());
?>

Expected result:
----------------
var_export($a);
output: stdClass::__set_state(array(1,2,3,4))

print_r(get_object_vars($a));
output: Array([0]=>1,[1]=>2,[2]=>3,[3]=>4)

print_r($r->getProperties());
output:
Array(
    [0]=>ReflectionProperty Object (
        [name]=>0
        [class]=>stdClass
    )
    ... and so on up to [3]
)

Actual result:
--------------
var_export($a);
output: stdClass::__set_state(array())

print_r(get_object_vars($a));
output: Array()

print_r($r->getProperties());
output:
    note: this result varies

ie1:

Array
(
    [0] => ReflectionProperty Object
        (
            [name] => ?.C?6??Xl??Ћ??*?v\?#?I?I
            [class] => stdClass
        )

    [1] => ReflectionProperty Object
        (
            [name] => M??F?Xl??Ћ??
            [class] => stdClass
        )

)

ie2:

Array
(
    [0] => ReflectionProperty Object
        (
            [name] => F7??5?h?? ??oMWM=[?*?"?I
            [class] => stdClass
        )

)