The FungibleTokenPacketData marshalling in the pseudocode was using protobuf, but the rest of the spec says "Note that both the FungibleTokenPacketData as well as FungibleTokenPacketAcknowledgement must be JSON-encoded (not Protobuf encoded) when they serialized into packet data." this is also what the ibc-go implementation does.
The
FungibleTokenPacketDatamarshalling in the pseudocode was using protobuf, but the rest of the spec says "Note that both theFungibleTokenPacketDataas well asFungibleTokenPacketAcknowledgementmust be JSON-encoded (not Protobuf encoded) when they serialized into packet data." this is also what the ibc-go implementation does.