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* Mike Pall:

> I hope the docs clear up many of your questions. If not, then
> please ask here. Feedback welcome!

I think it could be useful if you could create a cdata/userdata
combination.  This would allow access to the blob in a userdata as a C
structure, and you could still provide an object-specific metatable.

I think this is surprising (to a C++ programmer at least):

| Objects which are passed as an argument to an external C function
| are kept alive until the call returns.

I think the lifetime should extend to full expression, that is, beyond
the call.  The reason is that a function might return a pointer that
is passed in, such as:

  char *check_string(char *);

If this is called as


then the returned pointer will not keep the original pointer live.