*<Null safety>*
A decodeMessageWithCallback <A>(Message message, int inlineSize, A f(Decoder decoder))
A decodeMessageWithCallback<A>( Message message, int inlineSize, A Function(Decoder decoder) f) { final Decoder decoder = Decoder(message) ..claimMemory(kMessageHeaderSize + inlineSize); A out = f(decoder); _validateDecoding(decoder); return out; }