[cl-json-devel] Question about NIL translation

Continuing to work on my CL-JSON based JSON-RPC server, I am concerned about the fact that we translate NIL -> null. If a CL function returns NIL, and the return value is simply encoded into the JSON return package, then we get a message that /should/ indicate an error, according to the JSON-RPC server. In fact, if our CL function is invoked by JSON-RPC, then we really should have NIL either encoded as [] or as false, but /never/ as null. Any ideas about how we should modify invoke-rpc-parsed to fix this? What is the right way to tell CL-JSON to encode a false? Thanks, R