Macro handle_unshredded_case 

macro_rules! handle_unshredded_case {
    ($self:expr, $builder:expr, $metadata:expr, $index:expr, $partial_shredding:expr) => { ... };
}

Macro that handles the unshredded case (typed_value is missing or NULL) and returns early if handled. If not handled (shredded case), validates and returns the extracted value.