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On Tue, Nov 24, 2015 at 11:52 AM, Roberto Ierusalimschy
<> wrote:
> 1 - if its value is a function, that function is called (no parameters)

i like that option!

of course, when cleaning up is releasing a "resource", then it's
reasonable to call a (library defined) metamethod, but also allowing a
function to be called makes it so much nicer as an end user tool.