Object properties and immutability

There has been much discussion in recent weeks in PHP circles about how to make objects more immutable. There have been a number of proposals made either formally or informally that relate to object property access, all aimed at making objects safer through restricting write access in some way.

Since my last mega post on PHP object ergonomics was so well-received and successful (it resulted in both constructor promotion and named arguments being added to PHP 8.0, thanks Nikita!), I figure I'll offer another summary of the problem space in the hopes of a deeper analysis suggesting a unified way forward.

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