Description:
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defined() does not return boolean, it returns an integer according to gettype()

If you do a gettype() on isset(), it returns the type as boolean. If you do a gettype() on defined() it returns an integer.

The docs state defined() returns boolean and it makes logical sense to have defined() return boolean type.

Reproduce code:
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echo gettype(isset($test));
echo "<br>";
echo gettype(defined("test"));


Expected result:
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boolean
boolean


Actual result:
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boolean
integer