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To whit:
local function f(t, var)
print(var)
end
f(3, x or 2)
Prints 2 in Lua 5.1. Wouldn't have thought of doing that though, thanks for the idea! This is a great idiom.
(Am I missing something? Would your patch catch some case this wouldn't work with?)
function f(x,y=0)
function f(x,y or 0)
to mean
function f(x,y) y=y or 0
Neither would break existing code.
Which of the above should I choose to implement as a patch?