§11.5 Distinct write-side encoding.
optional device "magic" high byte on write
from field: uint32 prefix_high_byte = 3;
from field: moddef.v1.StorageType storage_type = 1;
Optional
from field: moddef.v1.Transform transform = 2;
from message moddef.v1.WriteEncoding
§11.5 Distinct write-side encoding.