[WIP] Implement literals Reader and Writer

modules/core/src/main/scala-2.12-/tethys/readers/instances/LiteralReaders.scala

@@ -0,0 +1,3 @@
+package tethys.readers.instances
+
+private[tethys] trait LiteralReaders

modules/core/src/main/scala-2.12-/tethys/writers/instances/LiteralWriters.scala

@@ -0,0 +1,3 @@
+package tethys.writers.instances
+
+private[tethys] trait LiteralWriters

modules/core/src/main/scala-2.13+/tethys/readers/instances/LiteralReaders.scala

@@ -0,0 +1,17 @@
+package tethys.readers.instances
+
+private[tethys] trait LiteralReaders {
+  implicit def booleanLiteralReader[L <: Boolean](implicit L: ValueOf[L]): JsonReader[L] = ???
+
+  implicit def stringLiteralReader[L <: String](implicit L: ValueOf[L]): JsonReader[L] = ???
+
+  implicit def shortLiteralReader[L <: Short](implicit L: ValueOf[L]): JsonReader[L] = ???
+
+  implicit def intLiteralReader[L <: Int](implicit L: ValueOf[L]): JsonReader[L] = ???
+
+  implicit def longLiteralReader[L <: Long](implicit L: ValueOf[L]): JsonReader[L] = ???
+
+  implicit def floatLiteralReader[L <: Float](implicit L: ValueOf[L]): JsonReader[L] = ???
+
+  implicit def doubleLiteralReader[L <: Double](implicit L: ValueOf[L]): JsonReader[L] = ???
+}

modules/core/src/main/scala-2.13+/tethys/writers/instances/LiteralWriters.scala

@@ -0,0 +1,17 @@
+package tethys.writers.instances
+
+private[tethys] trait LiteralWriters {
+  implicit def booleanLiteralReader[L <: Boolean](implicit L: ValueOf[L]): JsonReader[L] = ???
+
+  implicit def stringLiteralReader[L <: String](implicit L: ValueOf[L]): JsonReader[L] = ???
+
+  implicit def shortLiteralReader[L <: Short](implicit L: ValueOf[L]): JsonReader[L] = ???
+
+  implicit def intLiteralReader[L <: Int](implicit L: ValueOf[L]): JsonReader[L] = ???
+
+  implicit def longLiteralReader[L <: Long](implicit L: ValueOf[L]): JsonReader[L] = ???
+
+  implicit def floatLiteralReader[L <: Float](implicit L: ValueOf[L]): JsonReader[L] = ???
+
+  implicit def doubleLiteralReader[L <: Double](implicit L: ValueOf[L]): JsonReader[L] = ???
+}

modules/core/src/main/scala/tethys/readers/instances/AllJsonReaders.scala

@@ -4,7 +4,7 @@ import tethys.JsonReader
 import tethys.readers.tokens.TokenIterator
 import tethys.readers.{FieldName, ReaderError}
 
-trait AllJsonReaders extends OptionReaders {
+trait AllJsonReaders extends LiteralReaders with OptionReaders {
   implicit lazy val booleanReader: JsonReader[Boolean] = new JsonReader[Boolean] {
     override def read(it: TokenIterator)(implicit fieldName: FieldName): Boolean = {
       if(it.currentToken().isBooleanValue) {

modules/core/src/main/scala/tethys/writers/instances/AllJsonWriters.scala

@@ -3,7 +3,7 @@ package tethys.writers.instances
 import tethys.JsonWriter
 import tethys.writers.tokens.TokenWriter
 
-trait AllJsonWriters extends OptionWriters {
+trait AllJsonWriters extends LiteralWriters with OptionWriters {
   implicit lazy val intWriter: JsonWriter[Int] = new JsonWriter[Int] {
     override def write(value: Int, tokenWriter: TokenWriter): Unit = tokenWriter.writeNumber(value)
   }