Instead of adding more and more possible conditions on which the while-loop
inside client:sync() could stop, support passing a callback function which is
used to determine when to stop the loop.
The old "so N iterations behaviour" can be achieved with something like:
function iterate_n_times(n)
return function ()
n = n - 1
return n == 0
end
end
client:sync(iterate_n_times(10))
If no function is passed, the client:sync() function loops forever.
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