pub trait Extra {
// Required methods
fn insert_extra(&mut self, key: String, value: Value) -> Option<Value>;
fn get_extra(&mut self, key: &str) -> Option<&Value>;
fn remove_extra(&mut self, key: &str) -> Option<Value>;
}pub trait Extra {
// Required methods
fn insert_extra(&mut self, key: String, value: Value) -> Option<Value>;
fn get_extra(&mut self, key: &str) -> Option<&Value>;
fn remove_extra(&mut self, key: &str) -> Option<Value>;
}