Inline payload bytes.
Description of the payload.
External content reference, or an empty string for inline data.
Approximate encoded field and payload size.
Whether the chunk contains neither inline nor referenced data.
Whether this is the explicit null chunk used as a final terminator.
MIME type from metadata, or an empty string.
Smallest typed payload carried through an A11 node.
A chunk contains owned bytes plus optional metadata, or a
refto data held elsewhere. Serialization registries turn application objects into chunks; NodeFragments add identity, sequence, and finality for streaming. An empty octet-stream chunk is the explicit null/end marker used by unary flows.