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On Wednesday, July 3, 2013, Roberto Ierusalimschy wrote:

There is a difference, independently of whether we see it.

-- Roberto

What is your opinion on the effectiveness of providing a facility to discover if a variable is defined (has/exists and table.has/table.exists) and also one to delete/undefine an existing variables and key/value pairs?

Even if no other behavior in Lua were changed, could that not provide what was sought after by the introduction of a new type?

-- Andrew