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> If the emergency collection became the standard behavior of io.open I
> suspect that "beware that opening a file in Lua may trigger a full GC"
> would become one of those dreaded folk-wisdom performance tips.

In a generational collector, any allocation can trigger a major
collection. io.open allocates memory (to create the stream handle),
so this dreaded folk-wisdom performance tip is bound to happen anyway.
(Or maybe not?)

-- Roberto