@@ -41,11 +41,11 @@
     (OFArray OF_GENERIC(OFNumber *) *)subidentifiers
 {
 	self = [super init];
 
 	@try {
-		if ([subidentifiers count] < 1)
+		if (subidentifiers.count < 1)
 			@throw [OFInvalidFormatException exception];
 
 		switch ([[subidentifiers objectAtIndex: 0] intMaxValue]) {
 		case 0:
 		case 1:
@@ -71,21 +71,21 @@
 {
 	void *pool = objc_autoreleasePoolPush();
 	OFMutableArray OF_GENERIC(OFNumber *) *subidentifiers;
 
 	@try {
-		const unsigned char *items = [DEREncodedContents items];
-		size_t count = [DEREncodedContents count];
+		const unsigned char *items = DEREncodedContents.items;
+		size_t count = DEREncodedContents.count;
 		uintmax_t value = 0;
 		uint_fast8_t bits = 0;
 
 		if (tagClass != OF_ASN1_TAG_CLASS_UNIVERSAL ||
 		    tagNumber != OF_ASN1_TAG_NUMBER_OBJECT_IDENTIFIER ||
 		    constructed)
 			@throw [OFInvalidArgumentException exception];
 
-		if ([DEREncodedContents itemSize] != 1 || count == 0)
+		if (DEREncodedContents.itemSize != 1 || count == 0)
 			@throw [OFInvalidArgumentException exception];
 
 		subidentifiers = [OFMutableArray array];
 
 		for (size_t i = 0; i < count; i++) {
@@ -99,11 +99,11 @@
 				@throw [OFOutOfRangeException exception];
 
 			if (items[i] & 0x80)
 				continue;
 
-			if ([subidentifiers count] == 0) {
+			if (subidentifiers.count == 0) {
 				if (value < 40)
 					[subidentifiers addObject:
 					    [OFNumber numberWithUIntMax: 0]];
 				else if (value < 80) {
 					[subidentifiers addObject:
@@ -166,15 +166,15 @@
 	return true;
 }
 
 - (uint32_t)hash
 {
-	return [_subidentifiers hash];
+	return _subidentifiers.hash;
 }
 
 - (OFString *)description
 {
 	return [OFString stringWithFormat:
 	    @"<OFASN1ObjectIdentifier: %@>",
 	    [_subidentifiers componentsJoinedByString: @"."]];
 }
 @end