Index: src/PGConnection.m
==================================================================
--- src/PGConnection.m
+++ src/PGConnection.m
@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2012, 2013, 2014, 2015, 2016, 2017
+ * Copyright (c) 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
  *   Jonathan Schleifer <js@heap.zone>
  *
  * https://heap.zone/git/objpgsql.git
  *
  * Permission to use, copy, modify, and/or distribute this software for any
@@ -59,11 +59,11 @@
 		else
 			connectionInfo = [OFMutableString stringWithFormat:
 			    @"%@=%@", key, object];
 	}
 
-	if ((_connection = PQconnectdb([connectionInfo UTF8String])) == NULL)
+	if ((_connection = PQconnectdb(connectionInfo.UTF8String)) == NULL)
 		@throw [OFOutOfMemoryException exception];
 
 	if (PQstatus(_connection) == CONNECTION_BAD)
 		@throw [PGConnectionFailedException
 		    exceptionWithConnection: self];
@@ -84,11 +84,11 @@
 	_connection = NULL;
 }
 
 - (PGResult *)executeCommand: (OFConstantString *)command
 {
-	PGresult *result = PQexec(_connection, [command UTF8String]);
+	PGresult *result = PQexec(_connection, command.UTF8String);
 
 	if (PQresultStatus(result) == PGRES_FATAL_ERROR) {
 		PQclear(result);
 		@throw [PGCommandFailedException
 		    exceptionWithConnection: self
@@ -132,30 +132,30 @@
 			if ([parameter isKindOfClass: [OFString class]])
 				values[i++] = [parameter UTF8String];
 			else if ([parameter isKindOfClass: [OFNumber class]]) {
 				OFNumber *number = parameter;
 
-				switch ([number type]) {
+				switch (number.type) {
 				case OF_NUMBER_TYPE_BOOL:
-					if ([number boolValue])
+					if (number.boolValue)
 						values[i++] = "t";
 					else
 						values[i++] = "f";
 					break;
 				default:
-					values[i++] = [[number description]
-					    UTF8String];
+					values[i++] =
+					    number.description.UTF8String;
 					break;
 				}
 			} else if ([parameter isKindOfClass: [OFNull class]])
 				values[i++] = NULL;
 			else
-				values[i++] = [[parameter description]
-				    UTF8String];
+				values[i++] =
+				    [parameter description].UTF8String;
 		} while ((parameter = va_arg(args, id)) != nil);
 
-		result = PQexecParams(_connection, [command UTF8String],
+		result = PQexecParams(_connection, command.UTF8String,
 		    argsCount, NULL, values, NULL, NULL, 0);
 	} @finally {
 		[self freeMemory: values];
 	}
 
@@ -188,11 +188,11 @@
 
 	command = [OFMutableString stringWithString: @"INSERT INTO "];
 	[command appendString: table];
 	[command appendString: @" ("];
 
-	count = [row count];
+	count = row.count;
 
 	i = 0;
 	enumerator = [row keyEnumerator];
 	while ((key = [enumerator nextObject]) != nil) {
 		if (i > 0)
@@ -212,18 +212,18 @@
 		enumerator = [row objectEnumerator];
 		while ((value = [enumerator nextObject]) != nil) {
 			if (i > 0)
 				[command appendString: @", "];
 
-			values[i] = [value UTF8String];
+			values[i] = value.UTF8String;
 
 			[command appendFormat: @"$%zd", ++i];
 		}
 
 		[command appendString: @")"];
 
-		result = PQexecParams(_connection, [command UTF8String],
+		result = PQexecParams(_connection, command.UTF8String,
 		    (int)count, NULL, values, NULL, NULL, 0);
 	} @finally {
 		[self freeMemory: values];
 	}
 

Index: src/PGResult+Private.h
==================================================================
--- src/PGResult+Private.h
+++ src/PGResult+Private.h
@@ -27,10 +27,9 @@
 
 @interface PGResult ()
 @property (readonly, nonatomic) PGresult *pg_result;
 
 + (instancetype)pg_resultWithResult: (PGresult *)result;
-- (instancetype)pg_initWithResult: (PGresult *)result OF_METHOD_FAMILY(init)
-    OF_DESIGNATED_INITIALIZER;
+- (instancetype)pg_initWithResult: (PGresult *)result;
 @end
 
 OF_ASSUME_NONNULL_END

Index: src/PGResultRow+Private.h
==================================================================
--- src/PGResultRow+Private.h
+++ src/PGResultRow+Private.h
@@ -27,10 +27,9 @@
 
 @interface PGResultRow ()
 + (instancetype)pg_rowWithResult: (PGResult *)result
 			     row: (int)row;
 - (instancetype)pg_initWithResult: (PGResult *)result
-			      row: (int)row OF_METHOD_FAMILY(init)
-    OF_DESIGNATED_INITIALIZER;
+			      row: (int)row;
 @end
 
 OF_ASSUME_NONNULL_END

Index: src/PGResultRow.m
==================================================================
--- src/PGResultRow.m
+++ src/PGResultRow.m
@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2012, 2013, 2014, 2015, 2016, 2017
+ * Copyright (c) 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
  *   Jonathan Schleifer <js@heap.zone>
  *
  * https://heap.zone/git/objpgsql.git
  *
  * Permission to use, copy, modify, and/or distribute this software for any
@@ -33,21 +33,21 @@
 			return [OFNumber numberWithBool: YES];
 		else
 			return [OFNumber numberWithBool: NO];
 	case 21:  /* INT2OID */
 		return [OFNumber numberWithInt16:
-		    (int16_t)[string decimalValue]];
+		    (int16_t)string.decimalValue];
 	case 23:  /* INT4OID */
 		return [OFNumber numberWithInt32:
-		    (int32_t)[string decimalValue]];
+		    (int32_t)string.decimalValue];
 	case 20:  /* INT8OID */
 		return [OFNumber numberWithInt64:
-		    (int64_t)[string decimalValue]];
+		    (int64_t)string.decimalValue];
 	case 700: /* FLOAT4OID */
-		return [OFNumber numberWithFloat: [string floatValue]];
+		return [OFNumber numberWithFloat: string.floatValue];
 	case 701: /* FLOAT8OID */
-		return [OFNumber numberWithDouble: [string doubleValue]];
+		return [OFNumber numberWithDouble: string.doubleValue];
 	}
 
 	return string;
 }
 
@@ -74,17 +74,17 @@
 {
 	return [[[self alloc] initWithResult: result
 					 row: row] autorelease];
 }
 
-- initWithResult: (PGResult *)result
-	     row: (int)row
+- (instancetype)initWithResult: (PGResult *)result
+			   row: (int)row
 {
 	self = [super init];
 
 	_result = [result retain];
-	_res = [result pg_result];
+	_res = result.pg_result;
 	_row = row;
 
 	return self;
 }
 
@@ -168,17 +168,17 @@
 	return j;
 }
 @end
 
 @implementation PGResultRowEnumerator
-- initWithResult: (PGResult *)result
-	     row: (int)row
+- (instancetype)initWithResult: (PGResult *)result
+			   row: (int)row
 {
 	self = [super init];
 
 	_result = [result retain];
-	_res = [result pg_result];
+	_res = result.pg_result;
 	_row = row;
 	_count = PQnfields(_res);
 
 	return self;
 }