Improve feature table.

docs/source/features.rst

@@ -106,7 +106,7 @@ Explanations for a few categories are below (rest are self-explanatory).
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
 | udts: variables           |      ~      |     ~      |     ~    |    ~    |     ~    |     ✔     |     ~     |        ~       |     ~    |     ✗    |     ✔     |        ✗        |    ~   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
-| stack abstractions        |      ~      |     ✔      |     ~    |    ✔    |     ✔    |     ✔     |     ✔     |        ✔       |     ✔    |     ~    |     ✗     |        ~        |    ✔   |
+| stack abstractions        |      ~      |     ✔      |     ✔    |    ✔    |     ✔    |     ✔     |     ✔     |        ✔       |     ✔    |     ~    |     ✗     |        ~        |    ✔   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
 | lua function from C(++)   |      ~      |     ✔      |     ✔    |    ✔    |     ✔    |     ✔     |     ✔     |        ✔       |     ✔    |     ✔    |     ✔     |        ✔        |    ~   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
@@ -114,23 +114,23 @@ Explanations for a few categories are below (rest are self-explanatory).
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
 | protected function        |      ~      |     ✗      |     ~    |    ~    |     ~    |     ✔     |     ~     |        ✔       |     ~    |     ~    |     ~     |        ~        |    ~   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
-| multi-return              |      ~      |     ✗      |     ✗    |    ✔    |     ✔    |     ✔     |     ~     |        ✔       |     ✔    |     ~    |     ✔     |        ~        |    ~   |
+| multi-return              |      ~      |     ✗      |     ✔    |    ✔    |     ✔    |     ✔     |     ~     |        ✔       |     ✔    |     ~    |     ✔     |        ~        |    ~   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
-| variadic/variant argument |      ~      |     ✔      |     ✗    |    ✔    |     ✔    |     ✔     |     ~     |        ✔       |     ✔    |     ~    |     ~     |        ~        |    ✗   |
+| variadic/variant argument |      ~      |     ✔      |     ✔    |    ✔    |     ✔    |     ✔     |     ~     |        ✔       |     ✔    |     ~    |     ~     |        ~        |    ✗   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
-| inheritance               |      ~      |     ✔      |     ✗    |    ✔    |     ✔    |     ✔     |     ~     |        ~       |     ✔    |     ~    |     ✔     |        ~        |    ✗   |
+| inheritance               |      ~      |     ✔      |     ~    |    ✔    |     ✔    |     ✔     |     ~     |        ~       |     ✔    |     ~    |     ✔     |        ~        |    ✗   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
 | overloading               |      ~      |     ✗      |     ✗    |    ✗    |     ✗    |     ✔     |     ✗     |        ✗       |     ✔    |     ✔    |     ✔     |        ✗        |    ✗   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
-| lua thread                |      ~      |     ✗      |     ✗    |    ✗    |     ✗    |     ✔     |     ✔     |        ✗       |     ✔    |     ✗    |     ✗     |        ✗        |    ✗   |
+| lua thread                |      ~      |     ✗      |     ~    |    ✗    |     ✗    |     ✔     |     ✔     |        ✗       |     ✔    |     ✗    |     ✗     |        ✔        |    ✗   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
-| coroutines                |      ~      |     ✗      |     ✗    |    ✔    |     ✔    |     ✔     |     ✗     |        ✗       |     ✔    |     ✗    |     ✗     |        ✗        |    ✗   |
+| coroutines                |      ~      |     ✗      |     ~    |    ✔    |     ✔    |     ✔     |     ✗     |        ✗       |     ✔    |     ✗    |     ✗     |        ✔        |    ✗   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
-| no-rtti support           |      ✔      |     ✗      |     ~    |    ✗    |     ✗    |     ✔     |     ✔     |        ✗       |     ✔    |     ✔    |     ~     |        ✔        |    ~   |
+| no-rtti support           |      ✔      |     ✗      |     ✔    |    ✗    |     ✗    |     ✔     |     ✔     |        ✗       |     ✔    |     ✔    |     ~     |        ✔        |    ~   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
-| no-exception support      |      ✔      |     ✗      |     ~    |    ~    |     ✗    |     ✔     |     ✔     |        ✗       |     ✔    |     ✔    |     ~     |        ✔        |    ✗   |
+| no-exception support      |      ✔      |     ✗      |     ✔    |    ~    |     ✗    |     ✔     |     ✔     |        ✗       |     ✔    |     ✔    |     ~     |        ✔        |    ✗   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
-| Lua 5.1                   |      ✔      |     ✔      |     ~    |    ✔    |     ✗    |     ✔     |     ✔     |        ✔       |     ✔    |     ✔    |     ✔     |        ✗        |    ~   |
+| Lua 5.1                   |      ✔      |     ✔      |     ✔    |    ✔    |     ✗    |     ✔     |     ✔     |        ✔       |     ✔    |     ✔    |     ✔     |        ✗        |    ~   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+
 | Lua 5.2                   |      ✔      |     ✔      |     ✔    |    ✔    |     ✔    |     ✔     |     ✔     |        ✔       |     ✔    |     ✔    |     ✔     |        ✔        |    ✔   |
 +---------------------------+-------------+------------+----------+---------+----------+-----------+-----------+----------------+----------+----------+-----------+-----------------+--------+