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> On a related note, is it possible to detect reliably at run time which 
> exact version of Lua a script is being run on, i.e. which release number 
> and which patch level?
> It would be nice for a script to be able to detect that it's being run 
> on, for example: 5.1.4-patchlevel 3 instead of 5.1.5.

The whole point of minor releases is that this detection cannot be done,
because they are ABI compatible. See

However, it can be done in C if needed.