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Date: Thu, 15 May 2025 17:32:11 +0200
To: Rob Landers <rob@bottled.codes>
Cc: Stephen Reay <php-lists@koalephant.com>, Andreas Hennings
 <andreas@dqxtech.net>, Volker Dusch <volker@tideways-gmbh.com>, Matthew
 Weier O'Phinney <mweierophinney@gmail.com>, php internals
 <internals@lists.php.net>
Subject: Re: [PHP-DEV] [RFC] Clone with v2
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From: tim@bastelstu.be (=?UTF-8?Q?Tim_D=C3=BCsterhus?=)

Hi

Am 2025-05-15 14:14, schrieb Rob Landers:
> For example, if you have a Money type, you'd want to be able to ensure 
> it cannot be negative when updating via `with()`. This is super 
> important for ensuring constraints are met during the clone.

That's why the assignments during cloning work exactly like regular 
property assignments, observing visibility and property hooks.

The only tiny difference is that an “outsider” is able to change a 
`public(set) readonly` property after a `__clone()` method ran to 
completion and relied on the property in question not changing on the 
cloned object after it observed its value. This seems not to be 
something relevant in practice, because why would the exact value of the 
property only matter during cloning, but not at any other time?

Best regards
Tim Düsterhus