Description:
------------
Using an exit in your code causes a segfault. Before the segfault, the JS api throws an error saying "1 contexts left in runtime upon JS_DestroyRuntime"

Reproduce code:
---------------
<?php
echo "start\n";
$js = new JSContext();
echo "finish\n";
exit;

Expected result:
----------------
start
finish

Actual result:
--------------
start
finish
JS API usage error: 1 contexts left in runtime upon JS_DestroyRuntime.
JS engine warning: leaking GC root 'res->input' at 0x203be10
JS engine warning: 1 GC root remains after destroying the JSRuntime.
This root may point to freed memory. Objects reachable through it have not been finalized.
Segmentation fault