I am working on an application that compares two protocol buffers of
the same type for differences and generates a new 'delta' protocol
buffer with only the differences. This works fine for top level fields
but I can not see a way of dealing with repeating fields or nested
messages in a way that avoids including all of the repeating field
entries/nested message fields in the delta. Is it the case that
repeated fields are positional, in that they must all be present, as
opposed to being represented with their index? Is there any way of
approaching this issue or will the idea of 'delta' messages only work
with 'flat' buffer definitions. Any advice would be appreciated.
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