Nim devel brach(1.7.1) introduce gc=orc as default mode.
Because the p2p protocol using unsafe pointer operations
for it's ProtocolInfo and using global variables scattered
around, the orc mistakenly(or maybe correctly) crash the protocol.
Currently only setting `--styleCheck:hint` as there are some
dependency fixes required and the compiler seems to trip over the
findnode MessageKind, findnode Message field and the findNode
proc. Also over protocol.Protocol usage.
Lib2P2 handles RPC requests and responses with separate streams
while DEV2P2 is relying on tagged messages transmitted over a
single stream. To cover both models through the same application
code, we introduce a new `response` variable in the request handlers.
The user is supposed to issue a call to `response.send` in order to
reply to the request. Please note that the `response.send` signature
is strongly typed and depends on the current message.