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On Sat, Mar 7, 2020 at 1:09 AM Diego Nehab wrote:
On Fri, Mar 6, 2020 at 18:19 Egor Skriptunoff wrote:
IMO, that would make the whole proposal almost useless.

Do you think that accessing a multi-index table should only be done indirectly through a function that returns the multiple required indices? Or do you believe that this is would be the typical usage? 
I don’t. 

I believe using returned tuple as a multi-key would be a typical usage of multi-index.

Does it mean that
- t[i,j] will always invoke a metamethod,

It does solve exactly the problem it sets out to solve.

And what exactly was the problem?

Actually, your proposal is to introduce multi-index as just a syntactic sugar for invoking a function.
How  x=t[i,j]  would be better than  x=t:index(i,j)  ?