intval returns unxpected result for string with "." and "e" which is not documented.

[Sunvas]

echo intval('42.'); //42     ok
echo intval('42.42'); //42     ok
echo intval('42.42e'); //42    ok
echo intval('42.42e42'); //9223372036854775807

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From manual page: https://php.net/function.intval