diff --git a/layout.c b/layout.c
index 96af3f3..54a15a1 100644
--- a/layout.c
+++ b/layout.c
@@ -208,7 +208,7 @@ static bool unified_handle_layout_field( struct json_pull_parser* jpp, struct js
 			DEBUG_json_type_data( json_type_data, field_data, offset );
 
 			if( reader_deserialize( jpp, value, field_data, json_type_data, offset ) ) {
-				DEBUG_printf( "read value for %s\n", key );
+				DEBUG_printf( "read value for %s, *has_field=%p\n", key, *has_field );
 				**has_field = true;
 				return true;
 			}
@@ -366,8 +366,13 @@ static bool read_layout_with_downcast( struct json_pull_parser* jpp, struct json
 	for( int i = 0; i < required_field_count; ++i ) {
 		if( !has_field[i] ) {
 			int offset = i;
-			printf( "missing field[%d] '%s'\n", i, get_required_field_name(layout,&offset) );
+			printf( "missing field[%d] '%s' &has_field[]=%p\n", i, get_required_field_name(layout,&offset), &has_field[i] );
 			return false;
+		} else {
+			#ifdef DEBUG
+			int offset = i;
+			#endif
+			DEBUG_printf( "present field[%d] '%s' &has_field[]=%p\n", i, get_required_field_name(layout,&offset), &has_field[i] );
 		}
 	}
 
diff --git a/layout.h b/layout.h
index d3b52b4..a86f849 100644
--- a/layout.h
+++ b/layout.h
@@ -60,6 +60,11 @@ extern struct json_field_type json_field_bool;
 extern struct json_field_type json_field_bool_or_null;
 extern struct json_field_type json_field_fixed_bool;
 extern struct json_field_type json_field_bool_callback;
+struct rich_bool {
+	unsigned visible : 1;
+	unsigned value : 1;
+};
+extern struct json_field_type json_field_rich_bool;
 
 // layout/string.c
 extern struct json_field_type json_field_string;
@@ -310,6 +315,7 @@ struct json_field_type name ## _type = { \
 	.layout = name ## _layout, \
 	.alloc = name ## _alloc_shim, \
 	.free = name ## _free_shim, \
+	.type_string = #name, \
 }
 
 
diff --git a/layout/types/bool.c b/layout/types/bool.c
index d0c6d25..61f7ac8 100644
--- a/layout/types/bool.c
+++ b/layout/types/bool.c
@@ -7,11 +7,26 @@ static bool json_field_bool_reader( struct json_pull_parser* jpp, void* field_da
 {
 	return json_pull_parser_read_bool( jpp, (bool*)field_data );
 }
-static bool json_field_fixed_bool_reader( struct json_pull_parser* jpp, void* field_data, struct json_reflection* json_field_data, int offset )
+static bool json_field_bool_writer( struct json_writer* jw, const char* field_name, void* field_data, struct json_reflection* json_field_data, int offset )
 {
-	bool val = json_pull_parser_read_bool( jpp, (bool*)field_data );
-	return val == json_field_data->fixed_bool;
+	bool value = *(bool*)(field_data);
+	if( !json_field_data->always_write ) {
+		if( !json_field_data->required && !value ) {
+			return false;
+		}
+	}
+
+	json_write_field_name( jw, field_name );
+	fprintf( jw->f, value ? "true" : "false" );
+	return true;
 }
+struct json_field_type json_field_bool = {
+	.reader = json_field_bool_reader,
+	.writer = json_field_bool_writer,
+	.size = sizeof(bool),
+};
+
+
 static bool json_field_bool_or_null_reader( struct json_pull_parser* jpp, void* field_data, struct json_reflection* json_field_data, int offset )
 {
 	*(bool*)field_data = false;
@@ -31,43 +46,34 @@ static bool json_field_bool_or_null_reader( struct json_pull_parser* jpp, void*
 
 	return true;
 }
-static bool json_field_fixed_bool_writer( struct json_writer* jw, const char* field_name, void* field_data, struct json_reflection* json_field_data, int offset )
-{
-	bool value = json_field_data->fixed_bool;
+struct json_field_type json_field_bool_or_null = {
+	.reader = json_field_bool_or_null_reader,
+	.writer = json_field_bool_writer,
+	.size = sizeof(bool),
+	.type_string = "bool_or_null",
+};
 
-	json_write_field_name( jw, field_name );
-	fprintf( jw->f, value ? "true" : "false" );
-	return true;
+
+static bool json_field_fixed_bool_reader( struct json_pull_parser* jpp, void* field_data, struct json_reflection* json_field_data, int offset )
+{
+	bool val = json_pull_parser_read_bool( jpp, (bool*)field_data );
+	return val == json_field_data->fixed_bool;
 }
-static bool json_field_bool_writer( struct json_writer* jw, const char* field_name, void* field_data, struct json_reflection* json_field_data, int offset )
+static bool json_field_fixed_bool_writer( struct json_writer* jw, const char* field_name, void* field_data, struct json_reflection* json_field_data, int offset )
 {
-	bool value = *(bool*)(field_data);
-	if( !json_field_data->always_write ) {
-		if( !json_field_data->required && !value ) {
-			return false;
-		}
-	}
+	bool value = json_field_data->fixed_bool;
 
 	json_write_field_name( jw, field_name );
 	fprintf( jw->f, value ? "true" : "false" );
 	return true;
 }
-struct json_field_type json_field_bool = {
-	.reader = json_field_bool_reader,
-	.writer = json_field_bool_writer,
-	.size = sizeof(bool),
-};
 struct json_field_type json_field_fixed_bool = {
 	.reader = json_field_fixed_bool_reader,
 	.writer = json_field_fixed_bool_writer,
 	.size = sizeof(bool),
 };
-struct json_field_type json_field_bool_or_null = {
-	.reader = json_field_bool_or_null_reader,
-	.writer = json_field_bool_writer,
-	.size = sizeof(bool),
-	.type_string = "bool_or_null",
-};
+
+
 
 static bool json_field_bool_callback_reader( struct json_pull_parser* jpp, void* field_data, struct json_reflection* json_field_data, int offset )
 {
@@ -96,3 +102,32 @@ struct json_field_type json_field_bool_callback = {
 	.type_string = "bool",
 };
 
+
+static bool json_field_rich_bool_reader( struct json_pull_parser* jpp, void* field_data, struct json_reflection* json_field_data, int offset )
+{
+	struct rich_bool* rb = field_data;
+	bool value;
+	bool result = json_pull_parser_read_bool( jpp, &value );
+
+	rb->value = value;
+	rb->visible = result;
+
+	return result;
+}
+static bool json_field_rich_bool_writer( struct json_writer* jw, const char* field_name, void* field_data, struct json_reflection* json_field_data, int offset )
+{
+	struct rich_bool* rb = field_data;
+
+	if( !rb->visible ) {
+		return false;
+	}
+
+	json_write_field_name( jw, field_name );
+	fprintf( jw->f, rb->value ? "true" : "false" );
+	return true;
+}
+struct json_field_type json_field_rich_bool = {
+	.reader = json_field_rich_bool_reader,
+	.writer = json_field_rich_bool_writer,
+	.size = sizeof(bool),
+};
diff --git a/layout/types/object.c b/layout/types/object.c
index bc4ce9c..ccc1537 100644
--- a/layout/types/object.c
+++ b/layout/types/object.c
@@ -16,6 +16,7 @@ bool json_field_object_type_reader( struct json_pull_parser* jpp, void* field_da
 	struct json_field_type* ft = layout_field_data->type;
 
 	void* ptr = ft->alloc();
+	DEBUG_printf( "Parsing field of type %s\n", ft->type_string );
 
 	if( !json_read_object_layout( jpp, ft->layout, ptr ) ) {
 		ft->free( ptr );
diff --git a/layout/types/string.c b/layout/types/string.c
index b40e332..bb8ed5f 100644
--- a/layout/types/string.c
+++ b/layout/types/string.c
@@ -8,6 +8,9 @@ static bool json_field_string_reader( struct json_pull_parser* jpp, void* field_
 {
 	free( *(char**)field_data );
 	char* res = *(char**)field_data = json_pull_parser_read_string(jpp);
+
+	//printf( "string_reader, res=%s\n", res );
+
 	if( !res && !json_pull_parser_read_null(jpp) ) {
 		return false;
 	}