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[added] functional.find_best accepts (ignores) nil results for easy filtering
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@ -248,7 +248,7 @@ function _table.find_best(t, f)
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local current_best = -math.huge
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for k,e in pairs(t) do
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local v = f(e, k)
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if v > current_best then
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if v and v > current_best then
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current_best = v
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current = e
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end
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