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> But until 5.4.3 the code in luaossl worked in practice even though it was wrong in theory. [...]

Before 5.4.3, aux. buffers also used the stack, but only when their
content reached a minimum size (1K?).  So, there is a chance that your
code did not work in practice all the time, only when the practice did
not produce large enough strings.

>From this point of view, the new implementation is more robust, as it
exposes this kind of bug.

-- Roberto