Description:
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the Callable documentation at https://www.php.net/manual/en/language.types.callable.php 
says these things can be callable: a string containing a function name or "ClassName::StaticMethod", and an array containing containing an object or classname in index 0 and a string in index 1, and finally, closures.


but every PHP version since 5.3.0 (when __invoke was introduced) consider an object with an __invoke method to be callable as well,

either the documentation is lacking and objects with __invoke are indeed callable, or the php implementation is wrong, i'm guessing it's the former

Test script:
---------------
<?php 
class C{
function __invoke(){}
}
var_dump(is_callable(new C));

Expected result:
----------------
// according to Callable type documentation
bool(false)

Actual result:
--------------
bool(true)