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Due to how submessages are encoded (with a length prefix), nanopb currently does the encoding twice. It encodes once to get the length to write, then writes the length, then reencodes the entire message a 2nd time. This results in a requirement that each encode always encodes the same. Generally, this is fine, but it'd be nice to not make this a requirement. The double encode also requires going through the entire set of fields again, which has the possibility to be slow. Instead of doing this, write to a temporary SmallVector. Then we can just encode the length of that buffer, and do a memcpy into primary stream. Theoretically in most cases, this should be much faster.