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* Just like the original LuaJIT interpreter, this will use a hook to automatically
raise an error from Lua code.
* Unfortunately, as long as Jit compilation is enabled, this cannot reliably work.
Therefore we still set an `interrupted` flag that must be
polled from tight loops.
* Instead of polling via applause_push_sample() which gave interruption-support only
to Stream:play(), we now have a separate checkint() function.
* checkint() should be manually added to all tight loops.
* Stream:foreach() and everthing based on it is now also supporting interruptions
(via checkint()).
* This internally works via applause_is_interrupted().
A C function was exposed only because LuaJIT does not support volatile-qualifiers and
would optimize away reads to the interrupted-flag.
As a side effect, we can also reset the hook.
* Flags set in signal handlers should be `volatile`.
* Added likely() and unlikely() macros to C code.
* Updated sample.ipynb Jupyter notebook: Everything important is now supported, albeit
requiring custom ILua patches.
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