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> The metatable of `string` is itself.  It has a method __index.
> So it seems to be a feature, not a bug. :-)

Yes. But I cannot see what can be that feature.
>From the sources, the __index field inside `string` is a function
whose only purpose is to throw an error.
Why is that function needed?? In all other module tables (like table,
os, io, ...) indexing the table with an non-existent field simply
returns nil.