Re: [Feature Request?] __key

[Sean Conner <sean@...>]

It was thus said that the Great Soni L. once stated:
> After LuaConf 2016, more specifically the Lua stored procedures talk, I 
> kept thinking about something... They had to modify the Lua VM just so 
> they can decay userdata into keys when indexing, everything else could 
> be done with a substitution layer on top of Lua.
> 
> So, can we get a __key metamethod *for userdata only* that takes an 
> userdatum and returns a value to be used for table indexing?
> 
> For t[k] and t[k] = v this is pretty simple to understand, but Lua isn't 
> that simple:
> 
> - How should rawget() and rawset() work?
> - Should there be a way to invoke __index and __newindex without 
> invoking __key? (rawkeyset() and rawkeyget()?)
> - Should there be a way to invoke __key without indexing? (getkey()?) 
> (for use with rawset/rawget)
> - Or is this the wrong way to go about it?

  Previous discussions on __key:

http://lua-users.org/cgi-bin/namazu.cgi?query=__key&idxname=lua-l&max=20&result=normal&sort=date%3Aearly

  And just because ... __hash:

http://lua-users.org/cgi-bin/namazu.cgi?query=__hash&idxname=lua-l&max=20&result=normal&sort=date%3Aearly

  -spc (Wow ... that __hash one goes way back to 2003 I see ... )