Odd incorrect encoding of heterogenous map

[tylerprete]

With circe 0.1.1, I'm running the following program:

import io.circe._
import io.circe.generic.auto._
import io.circe.jawn._
import io.circe.syntax._

object Main {
  def main(args: Array[String]) {
    val funnyMap1 = Map("a" -> Map("str" -> "b", "map" -> Map("d" -> 1)))
    val weirdJs1 = funnyMap1.asJson.noSpaces 

    println(weirdJs1)
  }
}

With the result:

{"a":{"str":{},"map":{}}}

[alexarchambault]

Seems related to milessabin/shapeless#453. The second map (Map("str" -> "b", "map" -> Map("d" -> 1))) is inferred as Map[String, Object], and Object happens to have a (defective) Generic because of milessabin/shapeless#453.

[travisbrown]

Thanks for catching this, @tylerprete! That definitely shouldn't compile, and I've created #57 to track new tests that will verify that.