Description:
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ReflectionType::__toString() deprecated in PHP 7.1.0, however PHP 8.0.0beta4 has'nt thrown E_DEPRECATED.
This is probably a side effect of Stringable implementation.

Test script:
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<?php
error_reporting(E_ALL);
function foo(string $bar){};
echo (new ReflectionFunction("foo"))->getParameters()[0]->getType();

Expected result:
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Deprecated: Function ReflectionType::__toString() is deprecated in Command line code on line %n
string

Actual result:
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string