> > If somebody really wants a `mixed` property to be immutable, they could > write `private immutable null|bool|int|float|string|array|object > $property;`. >
Yeah, one of my ideas was to first add support for mixed (for which there have been a proposal/PR since quite some time), so that all non-typed properties could be implicitly upgraded to the mixed type. But I don't think it's the way to go... Maybe only if our long-term goal would be to deprecate/remove non-typed properties and implicit initialization altogether in favour of mixed type and implicit uninitialization... > That would make implementation straightforward, since you'd expect > `immutable` to be before a type declaration (can be done in the parser, > right?). > Yeah, the implementation didn't seem very tricky yet (but people with more experience with the internals of PHP should tell). However, Nikita also warned me not to support references. So this is another question to decide...
