[Fix] Handle NaN and other double serialization types

Author: nikhilsu

modules/openapi-generator/src/main/resources/scala-sttp/additionalTypeSerializers.mustache

@@ -71,5 +71,13 @@ trait AdditionalTypeSerializers {
     case s: String => Json.fromString(s)
     case other => Json.fromString(other.toString)
   }
+
+  implicit final lazy val NanTolerantDoubleDecoder: Decoder[Double] =
+    Decoder.decodeDouble.or(Decoder.decodeString.emap {
+      case "NaN" => Right(Double.NaN)
+      case "Infinity" => Right(Double.PositiveInfinity)
+      case "-Infinity" => Right(Double.NegativeInfinity)
+      case s => Left(s"Cannot decode '$s' as Double")
+  })
 }
 {{/circe}}

samples/client/petstore/scala-sttp-circe/src/main/scala/org/openapitools/client/core/AdditionalTypeSerializers.scala

@@ -48,4 +48,12 @@ trait AdditionalTypeSerializers {
     case s: String => Json.fromString(s)
     case other => Json.fromString(other.toString)
   }
+
+  implicit final lazy val NanTolerantDoubleDecoder: Decoder[Double] =
+    Decoder.decodeDouble.or(Decoder.decodeString.emap {
+      case "NaN" => Right(Double.NaN)
+      case "Infinity" => Right(Double.PositiveInfinity)
+      case "-Infinity" => Right(Double.NegativeInfinity)
+      case s => Left(s"Cannot decode '$s' as Double")
+  })
 }