Type Alias WriterItems 

pub type WriterItems<'a> = Box<dyn Iterator<Item = WriterItem<'a>> + Send + 'a>;

Boxed iterator of WriterItems — the return type of the three entry-point chunk walkers. Internal per-message helpers still yield bare RowValue via RowsIter; only the entry points interleave the usage item.

Aliased Type

pub struct WriterItems<'a>(/* private fields */);