Index: src/OFDataArray.m
==================================================================
--- src/OFDataArray.m
+++ src/OFDataArray.m
@@ -355,11 +355,11 @@
 	}
 }
 
 - copy
 {
-	OFDataArray *copy = [[OFDataArray alloc] initWithItemSize: itemSize];
+	OFDataArray *copy = [[isa alloc] initWithItemSize: itemSize];
 
 	[copy addNItems: count
 	     fromCArray: data];
 
 	return copy;
@@ -575,16 +575,6 @@
 	if (size != newSize)
 		data = [self resizeMemory: data
 				   toSize: newSize];
 	size = newSize;
 }
-
-- copy
-{
-	OFDataArray *copy = [[OFBigDataArray alloc] initWithItemSize: itemSize];
-
-	[copy addNItems: count
-	     fromCArray: data];
-
-	return copy;
-}
 @end

Index: src/OFList.m
==================================================================
--- src/OFList.m
+++ src/OFList.m
@@ -271,11 +271,11 @@
 	return NO;
 }
 
 - copy
 {
-	OFList *copy = [[OFList alloc] init];
+	OFList *copy = [[isa alloc] init];
 	of_list_object_t *iter, *listObject, *previous;
 
 	listObject = NULL;
 	previous = NULL;
 

Index: src/OFURL.m
==================================================================
--- src/OFURL.m
+++ src/OFURL.m
@@ -375,11 +375,11 @@
 	return hash;
 }
 
 - copy
 {
-	OFURL *copy = [[OFURL alloc] init];
+	OFURL *copy = [[isa alloc] init];
 
 	@try {
 		copy->scheme = [scheme copy];
 		copy->host = [host copy];
 		copy->port = port;