MediaAssemblyErrorKind

Kinds of failure that can terminate a media handle prematurely.

• "message-error" — the upstream message emitted an error event before completion.
• "stream-closed" — the transport stream closed before message-finish arrived (thread closed, transport dropped, etc.).
• "fetch-failed" — the block was url-sourced and the lazy fetch() rejected (CORS, 404, 5xx, network).