pub fn encode_nested_field(buf: &mut Vec<u8>, field_id: u64, nested_data: &[u8])Expand description
Encode a nested field (wire type 2).
Wire layout:
field_id (varint) │ 2 (varint) │ length (varint) │ nested_data [length]The nested_data is itself a sequence of TLV fields, pre-encoded
by the caller. This enables recursive structures like FileEntry
children inside a FileTreeBlock.