How do I typecast parameters with only specific numbers?

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#1 
function module._Compare(a: number, b: number, mode: number): boolean
	-- checks if a is greater than b (mode = 0)
	-- checks if a is smaller than b (mode = 1)
	mode = mode or 0
	if mode == 0 then
		return a > b
	else
		return a < b
	end
end

I want the function to expect mode only to be 1 or 0. I tried number: (1 | 0) but that didn’t work. What’s the correct syntax?

#2

Just assert if the number is greater than 1, example:

function module._Compare(a: number, b: number, mode: number): boolean
    mode = mode or 0
	assert(mode <= 1, ("%s cannot be more than 1"):format(tostring(mode))) --if you want add math.abs(mode) to prevent the injection of negative numbers

	if mode == 0 then
		return a > b
	else
		return a < b
	end
end

If I misunderstood you please tell me, hope this helps anyway!

#3

I want the typehinting to show this information

#4

I don’t really think you can…

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#5

You can’t.

Literal typechecking is only supported for strings and bools, not numbers.

As others have mentioned, just assert the mode argument.