Get rid double conversion Map => String => Map

Author: Igor-Palaguta

Sources/GraphQL/Execution/Values.swift

@@ -37,22 +37,11 @@ func getArgumentValues(argDefs: [GraphQLArgumentDefinition], argASTs: [Argument]
         let name = argDef.name
         let valueAST = argASTMap[name]?.value
 
-        var value = try valueFromAST(
+        let value = try valueFromAST(
             valueAST: valueAST,
             type: argDef.type,
             variables: variableValues
-        )
-
-        if value == nil {
-            value = try argDef.defaultValue.flatMap { string in
-                guard let data = string.data(using: .utf8) else {
-                    return nil
-                }
-                
-                let object = try JSONSerialization.jsonObject(with: data, options: .allowFragments)
-                return try map(from: object)
-            }
-        }
+        ) ?? argDef.defaultValue
 
         if let value = value {
             result[name] = value

Sources/GraphQL/Type/Definition.swift

@@ -667,7 +667,7 @@ public struct GraphQLArgument {
 public struct GraphQLArgumentDefinition {
     public let name: String
     public let type: GraphQLInputType
-    public let defaultValue: String?
+    public let defaultValue: Map?
     public let description: String?
 
     init(
@@ -678,7 +678,7 @@ public struct GraphQLArgumentDefinition {
     ) {
         self.name = name
         self.type = type
-        self.defaultValue = defaultValue?.description
+        self.defaultValue = defaultValue
         self.description = description
     }
 }

Sources/GraphQL/Type/Introspection.swift

@@ -360,7 +360,7 @@ let __InputValue = try! GraphQLObjectType(
                     return nil
                 }
 
-                return .string(defaultValue)
+                return .string(defaultValue.description)
             }
         )
     ]