Description:
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I've just looked into PHP 7.4s property typing. I'm a little disappointed, that this is currently limited to properties, and can not be applied to any variables.

Luckily v2 supports references to properties. So I'm pretty sure somebody is gonna provide a little library to construct typed variables by linkin a variable to the reference set of a typed property.

But what isn't mentioned in the typed_properties_v2 RFC, is how the garbage collector affects the typing due to reducing the reference set. This can produce unexpected behavior.


Possible solutions:
* Forbid references: https://wiki.php.net/rfc/typed_properties_v2#forbid_references
* Add typed variables (seems unlikely, but i'm hoping for this)
* Just document the behavior

Test script:
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https://3v4l.org/ctEgn

Expected result:
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string(3) "123"
string(3) "123"

Actual result:
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int(123)
string(3) "123"