Added some code review comments.

src/Network/NWConnection.cs

@@ -512,7 +512,7 @@ namespace Network {
 		}
 
 		[DllImport (Constants.NetworkLibrary)]
-		extern static uint nw_connection_get_maximum_datagram_size (IntPtr handle);
+		extern static /* uint32_t */ uint nw_connection_get_maximum_datagram_size (IntPtr handle);
 
 		public uint MaximumDatagramSize => nw_connection_get_maximum_datagram_size (GetHandle());
 

src/Network/NWContentContext.cs

@@ -78,11 +78,11 @@ namespace Network {
 
 		[TV (12,0), Mac (10,14), iOS (12,0)]
 		[DllImport (Constants.NetworkLibrary)]
-		extern static ulong nw_content_context_get_expiration_milliseconds (IntPtr handle);
+		extern static /* uint64_t */ ulong nw_content_context_get_expiration_milliseconds (IntPtr handle);
 
 		[TV (12,0), Mac (10,14), iOS (12,0)]
 		[DllImport (Constants.NetworkLibrary)]
-		extern static void nw_content_context_set_expiration_milliseconds (IntPtr handle, ulong value);
+		extern static void nw_content_context_set_expiration_milliseconds (IntPtr handle, /* uint64_t */ ulong value);
 
 		[TV (12,0), Mac (10,14), iOS (12,0)]
 		public ulong ExpirationMilliseconds {

src/Network/NWError.cs

@@ -33,7 +33,7 @@ namespace Network {
 		public NWErrorDomain ErrorDomain => nw_error_get_error_domain (GetHandle());
 
 		[DllImport (Constants.NetworkLibrary)]
-		static extern int nw_error_get_error_code (IntPtr handle);
+		static extern /* int */ int nw_error_get_error_code (IntPtr handle);
 
 		public int ErrorCode => nw_error_get_error_code (GetHandle());
 

src/Network/NWInterface.cs

@@ -34,7 +34,7 @@ namespace Network {
 
 		[TV (12,0), Mac (10,14), iOS (12,0)]
 		[DllImport (Constants.NetworkLibrary)]
-		static extern uint nw_interface_get_index (OS_nw_interface iface);
+		static extern /* uint32_t */ uint nw_interface_get_index (OS_nw_interface iface);
 
 		public uint Index => nw_interface_get_index (GetHandle());
 	}

src/Network/NWProtocolMetadata.cs

@@ -125,14 +125,14 @@ namespace Network {
 
 		[TV (12,0), Mac (10,14), iOS (12,0)]
 		[DllImport (Constants.NetworkLibrary)]
-		extern static uint nw_tcp_get_available_receive_buffer (IntPtr handle);
+		extern static /* uint32_t */ uint nw_tcp_get_available_receive_buffer (IntPtr handle);
 
 		[TV (12,0), Mac (10,14), iOS (12,0)]
 		public uint TcpGetAvailableReceiveBuffer () => nw_tcp_get_available_receive_buffer (GetHandle());
 
 		[TV (12,0), Mac (10,14), iOS (12,0)]
 		[DllImport (Constants.NetworkLibrary)]
-		extern static uint nw_tcp_get_available_send_buffer (IntPtr handle);
+		extern static /* uint32_t */ uint nw_tcp_get_available_send_buffer (IntPtr handle);
 
 		[TV (12,0), Mac (10,14), iOS (12,0)]
 		public uint TcpGetAvailableSendBuffer () => nw_tcp_get_available_send_buffer (GetHandle());