The RFC proposes to add a few warnings when encountering certain edge cases in PHP 8.5,
and promote those to error in PHP 9.
Warn when coercing NAN to other types?
Warn when casting out of range floats to int?
Warn when destructuring non-array values?
Warn when using offsets on non-container values in isset()/empty()?
Warn when using invalid offset types when checking string offsets with isset()/empty()?