# Takes a camel case `self` and converts it to snake case
	#
	# SEE: `to_snake_case`
	fun snake_case do
		if self.is_lower then return
		var prev_is_lower = false
		var prev_is_upper = false

		var i = 0
		while i < length do
			var char = chars[i]
			if char.is_lower then
				prev_is_lower = true
				prev_is_upper = false
			else if char.is_upper then
				if prev_is_lower then
					insert_char('_', i)
					i += 1
				else if prev_is_upper and i + 1 < length and self[i + 1].is_lower then
					insert_char('_', i)
					i += 1
				end
				self[i] = char.to_lower
				prev_is_lower = false
				prev_is_upper = true
			else
				prev_is_lower = false
				prev_is_upper = false
			end
			i += 1
		end
	end