prost: relax codec Default bounds#2681
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Manually implement Default for ProstEncoder and ProstDecoder so their message types do not need to implement Default. Fixes: grpc#2458
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Manually implement Default for ProstEncoder and ProstDecoder so their message types do not need to implement Default.
Fixes: #2458
Motivation
ProstEncoder<T>andProstDecoder<U>currently deriveDefault, which adds unnecessaryT: Default/U: Defaultbounds.Solution
Remove the derived
Defaultimpls forProstEncoderandProstDecoder, and replace them with manual impls that callSelf::new(Default::default()).