fromMapElems.scala

  inline def fromMapElems[A <: Product, T <: Tuple, L <: Tuple](map: Map[String, Value], index: Int, arr: Array[Any]): Unit = {
    inline erasedValue[T] match
      case _: (hd *: tl) =>
        inline erasedValue[L] match
          case _: (hdLabel *: tlLabels) =>
            import fabric.rw.given
            val hdLabelValue = constValue[hdLabel].asInstanceOf[String]
            val hdValueOption = map.get(hdLabelValue)
            val hdWritable = summonInline[Writer[hd]]
            val valueOption = hdWritable.map(_.write(hdValue))
            def default = {
              val defaultOption = ???
              defaultOption.getOrElse(throw new RuntimeException(s"Unable to find field $hd.${hdLabelValue} (and no defaults set) in ${Obj(map)}"))
            }
            val value = valueOption.getOrElse(default)
            arr(index) = value
            fromMapElems[A, tl, tlLabels](map, index + 1, arr)
          case EmptyTuple => sys.error("Not possible")
      case EmptyTuple => // Finished
  }