Combining ref types with generics causes a compilation error

[zah]

import json
import json_serialization

type
  RpcResponse*[T] = ref object
    result*: T
    id*: int
    error*: string

when isMainModule:
  echo("Hello, World!")
  let jsn = %* {
    "result": "0x0",
    "id": 0
  }
  echo Json.decode($jsn, RpcResponse[string])

Error:

/usr/local/Cellar/nim/1.2.0/nim/lib/system.nim(850, 11) Error: invalid type: 'T' in this context: 'ref RpcResponse:ObjectType' for var

[zah]

Possible work-around:

import json
import json_serialization

type
  RpcResponse*[T] = object
    result*: T
    id*: int
    error*: string

  RpcResponseRef*[T] = ref RpcResponse[T]

when isMainModule:
  echo("Hello, World!")
  let jsn = %* {
    "result": "0x0",
    "id": 0
  }
  echo Json.decode($jsn, RpcResponse[string])
  echo Json.decode($jsn, RpcResponseRef[string])[] # Notice that I'm dereferencing the result here, so it can be printed by echo