diff --git a/js/src/main/scala/io/kaitai/struct/format/JavaScriptKSYParser.scala b/js/src/main/scala/io/kaitai/struct/format/JavaScriptKSYParser.scala
index f2ca22629..bb739b82c 100644
--- a/js/src/main/scala/io/kaitai/struct/format/JavaScriptKSYParser.scala
+++ b/js/src/main/scala/io/kaitai/struct/format/JavaScriptKSYParser.scala
@@ -29,7 +29,7 @@ object JavaScriptKSYParser {
 
   def yamlJavascriptToScala(src: Any): Any = {
     src match {
-      case array: js.Array[AnyRef] =>
+      case array: js.Array[_] =>
         array.toList.map(yamlJavascriptToScala)
       case _: String | _: Int | _: Double | _: Boolean =>
         src
diff --git a/jvm/src/main/scala/io/kaitai/struct/formats/JavaKSYParser.scala b/jvm/src/main/scala/io/kaitai/struct/formats/JavaKSYParser.scala
index 1096dc1ef..986738b1c 100644
--- a/jvm/src/main/scala/io/kaitai/struct/formats/JavaKSYParser.scala
+++ b/jvm/src/main/scala/io/kaitai/struct/formats/JavaKSYParser.scala
@@ -82,9 +82,9 @@ object JavaKSYParser {
 
   def yamlJavaToScala(src: Any): Any = {
     src match {
-      case jlist: JList[AnyRef] =>
+      case jlist: JList[_] =>
         jlist.asScala.toList.map(yamlJavaToScala)
-      case jmap: JMap[String, AnyRef] =>
+      case jmap: JMap[_, _] =>
         jmap.asScala.toMap.view.mapValues(yamlJavaToScala).toMap
       case _: String =>
         src
diff --git a/shared/src/main/scala/io/kaitai/struct/JSON.scala b/shared/src/main/scala/io/kaitai/struct/JSON.scala
index b86b3a25f..bcec10ca9 100644
--- a/shared/src/main/scala/io/kaitai/struct/JSON.scala
+++ b/shared/src/main/scala/io/kaitai/struct/JSON.scala
@@ -24,7 +24,7 @@ object JSON extends CommonLiterals {
       case v: Int => v.toString
       case v: String => stringToJson(v)
       case v: collection.Seq[_] => seqToJson(v)
-      case v: Map[String, _] => mapToJson(v)
+      case v: Map[_, _] => mapToJson(v)
     }
   }
 
@@ -37,9 +37,9 @@ object JSON extends CommonLiterals {
   def seqToJson(obj: collection.Seq[_]): String =
     "[" + obj.map((x) => stringify(x)).mkString(",") + "]"
 
-  def mapToJson(obj: Map[String, Any]): String = {
+  def mapToJson(obj: Map[_, _]): String = {
     val kvs = obj.map { case (k, v) =>
-      stringToJson(k) + ": " + stringify(v)
+      stringToJson(k.toString) + ": " + stringify(v)
     }
     "{" + kvs.mkString(",") + "}"
   }
diff --git a/shared/src/main/scala/io/kaitai/struct/datatype/Endianness.scala b/shared/src/main/scala/io/kaitai/struct/datatype/Endianness.scala
index 592c13e07..3b363e158 100644
--- a/shared/src/main/scala/io/kaitai/struct/datatype/Endianness.scala
+++ b/shared/src/main/scala/io/kaitai/struct/datatype/Endianness.scala
@@ -27,7 +27,7 @@ object Endianness {
       case None => None
       case Some("be") => Some(BigEndian)
       case Some("le") => Some(LittleEndian)
-      case Some(srcMap: Map[Any, Any]) =>
+      case Some(srcMap: Map[_, _]) =>
         val endianMap = ParseUtils.asMapStr(srcMap, path)
         Some(fromMap(endianMap, path))
       case _ =>
diff --git a/shared/src/main/scala/io/kaitai/struct/format/AttrSpec.scala b/shared/src/main/scala/io/kaitai/struct/format/AttrSpec.scala
index 09e1b941f..b2c67a6b8 100644
--- a/shared/src/main/scala/io/kaitai/struct/format/AttrSpec.scala
+++ b/shared/src/main/scala/io/kaitai/struct/format/AttrSpec.scala
@@ -219,7 +219,7 @@ object AttrSpec {
             DataType.fromYaml(
               Some(simpleType), path, metaDef, yamlAttrArgs
             )
-          case switchMap: Map[Any, Any] =>
+          case switchMap: Map[_, _] =>
             val switchMapStr = ParseUtils.anyMapToStrMap(switchMap, path)
             parseSwitch(switchMapStr, path ++ List("type"), metaDef, yamlAttrArgs)
           case unknown =>
diff --git a/shared/src/main/scala/io/kaitai/struct/format/EnumValueSpec.scala b/shared/src/main/scala/io/kaitai/struct/format/EnumValueSpec.scala
index 6e17ac053..bb7dcfe3d 100644
--- a/shared/src/main/scala/io/kaitai/struct/format/EnumValueSpec.scala
+++ b/shared/src/main/scala/io/kaitai/struct/format/EnumValueSpec.scala
@@ -11,7 +11,7 @@ object EnumValueSpec {
         fromSimpleName(name, path)
       case x: Boolean =>
         fromSimpleName(x.toString, path)
-      case srcMap: Map[Any, Any] =>
+      case srcMap: Map[_, _] =>
         fromMap(ParseUtils.anyMapToStrMap(srcMap, path), path)
       case _ =>
         throw KSYParseError.badType("string or map", src, path)
diff --git a/shared/src/main/scala/io/kaitai/struct/format/ParseUtils.scala b/shared/src/main/scala/io/kaitai/struct/format/ParseUtils.scala
index 97652f03d..ee023b08c 100644
--- a/shared/src/main/scala/io/kaitai/struct/format/ParseUtils.scala
+++ b/shared/src/main/scala/io/kaitai/struct/format/ParseUtils.scala
@@ -127,12 +127,12 @@ object ParseUtils {
   ): List[T] = {
     val pathField = path ++ List(field)
     src.get(field) match {
-      case Some(srcList: List[Any]) =>
+      case Some(srcList: List[_]) =>
         srcList.zipWithIndex.map { case (element, idx) =>
           convertFunc(element, pathField ++ List(idx.toString))
         }
-      case Some(singleObject: T) =>
-        List(singleObject)
+      case Some(singleObject) =>
+        List(convertFunc(singleObject, pathField))
       case None =>
         List()
       case unknown =>
@@ -197,9 +197,9 @@ object ParseUtils {
     }
   }
 
-  def asMap(src: Any, path: List[String]): Map[Any, Any] = {
+  def asMap(src: Any, path: List[String]): Map[_, _] = {
     src match {
-      case srcMap: Map[Any, Any] =>
+      case srcMap: Map[_, _] =>
         srcMap
       case unknown =>
         throw KSYParseError.badType("map", unknown, path)
@@ -212,14 +212,14 @@ object ParseUtils {
   def asMapStrStr(src: Any, path: List[String]): Map[String, String] =
     anyMapToStrStrMap(asMap(src, path), path)
 
-  def anyMapToStrMap(anyMap: Map[Any, Any], path: List[String]): Map[String, Any] = {
+  def anyMapToStrMap[V](anyMap: Map[_, V], path: List[String]): Map[String, V] = {
     anyMap.map { case (key, value) =>
       val keyStr = asStr(key, path)
       keyStr -> value
     }
   }
 
-  def anyMapToStrStrMap(anyMap: Map[Any, Any], path: List[String]): Map[String, String] = {
+  def anyMapToStrStrMap(anyMap: Map[_, _], path: List[String]): Map[String, String] = {
     anyMap.map { case (key, value) =>
       val keyStr = asStr(key, path)
       val valueStr = asStr(value, path ++ List(keyStr))
diff --git a/shared/src/main/scala/io/kaitai/struct/format/ValidationSpec.scala b/shared/src/main/scala/io/kaitai/struct/format/ValidationSpec.scala
index 5142517c4..1fc84ef87 100644
--- a/shared/src/main/scala/io/kaitai/struct/format/ValidationSpec.scala
+++ b/shared/src/main/scala/io/kaitai/struct/format/ValidationSpec.scala
@@ -86,7 +86,7 @@ object ValidationSpec {
         fromString(x.toString, path)
       case x: Long =>
         fromString(x.toString, path)
-      case srcMap: Map[Any, Any] =>
+      case srcMap: Map[_, _] =>
         fromMap(ParseUtils.anyMapToStrMap(srcMap, path), path)
       case _ =>
         throw KSYParseError.badType("string or map", src, path)