The highest tagged major version is v2.

codec/

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Path	Synopsis
bsonrpc Package bsonrpc provides a bson-rpc codec	Package bsonrpc provides a bson-rpc codec
json-iterator module
jsonrpc2 Package jsonrpc2 provides a json-rpc 2.0 codec Based on powerman/rpc-codec: The MIT License (MIT) Copyright (c) 2015 Alex Efros	Package jsonrpc2 provides a json-rpc 2.0 codec Based on powerman/rpc-codec: The MIT License (MIT) Copyright (c) 2015 Alex Efros
msgpackrpc Package msgpackrpc provides a msgpack-rpc codec	Package msgpackrpc provides a msgpack-rpc codec
segmentio module