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Subject: Re: [PHP-DEV] [RFC] Alternative typehinting syntax for accessors
From: levim@php.net (Levi Morrison)

>We should also consider how an author would allow type-hinted properties to accept NULL as a new value, in both proposals.

public $foo {
    get;
    set(Foo $value = NULL) { $this->foo = $value; }
}

Would work for traditional type-hints.