RFC Tracker

Throws a catchable MemoryError for allocations that are obviously too large, instead of a fatal error.

Allows the #[\Deprecated] attribute on interfaces.

Adds a fallthrough; marker to switch and warns when a non-empty case falls through to the next one without it.

Adds path segment accessors to the URI extension so paths no longer need splitting by hand.

Adds a #[\NonExhaustive] attribute that marks an enum as likely to gain cases, so code matching on it knows to handle unknown ones.

Adds FILTER_VALIDATE_STRLEN to validate string length in UTF-8 code points.

Lets __sleep() return null or nothing, so it runs as a pre-serialization hook and the engine then serializes the object as usual.

Adds a #[\NotSerializable] attribute that makes the engine refuse to serialize() or unserialize() instances of a class.