How can I improve the way my unicode progress bar is written?

Help and Feedback Code Review
#1

Hi, so I made this very barebone unicode progressbar generator but I feel like the way I wrote it kinda sucks, but I don’t know how to improve it.
Does anyone have any tips on how to improve it?

Here is the generator:

local textProgressBar = {}

local BLOCKS = {[0] = "" --[[ Necessary as indices start at 1 ]], "▏","▎","▍","▌","▋","▊","▉","█"} -- to self: smooth right to left bars are not possible as the necessary characters do not exist in unicode
local INTERVAL = 1/8
local INTERVAL_DENOMINATOR = 8

local function quantize(value: number, interval: number): number

	local result = value
	if result % interval >= interval / 2 then
		result = result + (interval - result % interval)
	elseif result % interval < interval / 2 then
		result = result - result % interval
	end

	return result
end

function textProgressBar.generateBar(value: number, length: number, minRangeValue: number, maxRangeValue: number): string
	local bar = ""

	local normalizedValue = (value - minRangeValue) / (maxRangeValue - minRangeValue)
	local scaledValue = length * normalizedValue

	local scaledValueWhole, scaledValueMantissa = math.modf(scaledValue)

	local quantizedScaledValueMantissa = quantize(scaledValueMantissa, INTERVAL)

	for index = 1, scaledValueWhole, 1 do
		bar ..= BLOCKS[8]
	end
	bar ..= BLOCKS[quantizedScaledValueMantissa * INTERVAL_DENOMINATOR --[[denominator of 1/8]] ]
	
	return bar
end

return textProgressBar

What particularly bothers me is that I don’t know how I could fix up this part:

local INTERVAL = 1/8
local INTERVAL_DENOMINATOR = 8