Description (from LUA 4 Manual: 6.1 Basic Functions)
"Returns the 'size' of a table, when seen as a list. If the table has an n field with a numeric value, this value is the 'size' of the table. Otherwise, the 'size' is the largest numerical index with a non-nil value in the table. This function could be defined in Lua:"
function getn (t)
	if type(t.n) == "number" then return t.n end
	local max = 0
	for i, _ in t do
		if type(i) == "number" and i>max then max=i end
	return max

<tTable>: the table to get the size of.
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