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<!-- contributed by Erik Vold [erikvvold@gmail.com] -->
The `unload+` module allows modules to register callbacks that are called
when they are unloaded, and associate unload functions to containers to have the
unloader automatically deleted when the container unloads.
<api name="unload">
@function
Save callbacks to run when unloading in a unload queue. Optionally scope the
callback to a container, e.g., window. Provide a way to run all the callbacks.
@param callback {function}
A function to be called when the module unloads.
@param [container] {object}
Optional container object; if the container "unloads" before the module
unloads, then the associated callback is removed from the unload queue.
@returns {function}
Returns a function which will allow one to remove the callback from the unload
queue.
</api>
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