Consider default parameters in generated functions

When appropriate, e.g. for fetchRequest, but not for
`entity()` (which maps to a specific ObjC selector).

Author: helje5

Sources/ManagedModelMacros/ModelMacro/ModelMembers.swift

@@ -50,7 +50,8 @@ extension ModelMacro: MemberMacro { // @attached(member, names:...)
     )
 
     if classDecl.findFunctionWithName("fetchRequest", isStaticOrClass: true,
-                                      parameterCount: 0) == nil
+                                      numberOfParametersWithoutDefaults: 0)
+       == nil
     {
       let modelClassName = modelClassName.text
       newMembers.append(

Sources/ManagedModelMacros/Utilities/ClassDeclSyntax+Extras.swift

@@ -35,7 +35,8 @@ extension ClassDeclSyntax {
 extension ClassDeclSyntax {
 
   func findFunctionWithName(_ name: String, isStaticOrClass: Bool,
-                            parameterCount: Int? = nil)
+                            parameterCount: Int? = nil,
+                            numberOfParametersWithoutDefaults: Int? = nil)
        -> FunctionDeclSyntax?
   {
     for member : MemberBlockItemSyntax in memberBlock.members {
@@ -48,6 +49,10 @@ extension ClassDeclSyntax {
       if let parameterCount {
         guard parameterCount == funcDecl.parameterCount else { continue }
       }
+      if let numberOfParametersWithoutDefaults {
+        guard numberOfParametersWithoutDefaults ==
+                funcDecl.numberOfParametersWithoutDefaults else { continue }
+      }
 
       // filter out operators and different names
       guard case .identifier(let idName) = funcDecl.name.tokenKind,