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--- Disconnect from a signal.
-- @tparam string name The name of the signal.
-- @tparam function func The callback that should be disconnected.
-- @function disconnect_signal
--- Emit a signal.
--
-- @tparam string name The name of the signal.
-- @param ... Extra arguments for the callback functions. Each connected
-- function receives the object as first argument and then any extra
-- arguments that are given to emit_signal().
-- @function emit_signal
--- Connect to a signal.
-- @tparam string name The name of the signal.
-- @tparam function func The callback to call when the signal is emitted.
-- @function connect_signal
--- Connect to a signal weakly.
--
-- This allows the callback function to be garbage collected and
-- automatically disconnects the signal when that happens.
--
-- **Warning:**
-- Only use this function if you really, really, really know what you
-- are doing.
-- @tparam string name The name of the signal.
-- @tparam function func The callback to call when the signal is emitted.
-- @function weak_connect_signal
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