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Peter Hill wrote:

It sounds like, if "%" is still going to be kept (rather than just
outlawed), then its default behaviour should be changed to reflect its old

Well I guess I would rather see it outlawed completely.
My opinion is fair and impartial, because I did never use
upvalues with Lua 4.0 ;-)

Seriously, I think removing the old upvalue syntax cleans
the accepted language little, and the current state might
cause porting problems. I would rather get syntax error,
instead of slight behaviour change.