diff --git a/Useful Modules/Util/UniqueIds.luau b/Useful Modules/Util/UniqueIds.luau
index f728465..17e2fa2 100644
--- a/Useful Modules/Util/UniqueIds.luau	
+++ b/Useful Modules/Util/UniqueIds.luau	
@@ -19,9 +19,8 @@ local Base93 = require(script.Parent.Base93)
 --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 
 export type UniqueIds = {
-	GetNewId: (UniqueIds) -> (string);
-	FreeId: (UniqueIds, string) -> (boolean);
-	GetIdIndex: (UniqueIds, string) -> (number);
+	GetNewId: (UniqueIds) -> string;
+	FreeId: (UniqueIds, string) -> ();
 }
 
 --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
@@ -36,11 +35,11 @@ function UniqueIds.new(bytes: number, b93: boolean?, idsInUse: {string}?): Uniqu
 
 	if idsInUse then
 		for _, id in idsInUse do
-			numUniqueIds = math.max(numUniqueIds, (if b93 then Base93.B93ToInt(id) else string.unpack("I" .. bytes, id)) + 1)
+			numUniqueIds = math.max(numUniqueIds, UniqueIds:GetIndexFromId(bytes, id, b93) + 1)
 		end
 
 		for index = 1, numUniqueIds do
-			local id = if b93 then Base93.IntToB93(index - 1, bytes) else string.pack("I" .. bytes, index - 1)
+			local id = UniqueIds:GetIdFromIndex(bytes, index - 1, b93)
 			if not table.find(idsInUse, id) then
 				table.insert(unusedIds, id)
 				numUnusedIds += 1
@@ -55,24 +54,17 @@ function UniqueIds.new(bytes: number, b93: boolean?, idsInUse: {string}?): Uniqu
 				numUnusedIds -= 1
 				return id
 			else
-				local id = if b93 then Base93.IntToB93(numUniqueIds, bytes) else string.pack("I" .. bytes, numUniqueIds)
+				local id = UniqueIds:GetIdFromIndex(bytes, numUniqueIds, b93)
 				numUniqueIds += 1
 				return id
 			end
 		end;
 
-		FreeId = function(self: UniqueIds, id: string): boolean
-			local index = self:GetIdIndex(id)
-			if index + 1 <= numUniqueIds then
-				table.insert(unusedIds, id)
-				numUnusedIds += 1
-				return true
-			end
-			return false
-		end;
-
-		GetIdIndex = function(self: UniqueIds, id: string): number
-			return if b93 then Base93.B93ToInt(id) else string.unpack("I" .. bytes, id)
+		FreeId = function(self: UniqueIds, id: string): ()
+			local index = UniqueIds:GetIndexFromId(bytes, id, b93)
+			assert(index < numUniqueIds and not table.find(unusedIds, id), "ID not in use")
+			table.insert(unusedIds, id)
+			numUnusedIds += 1
 		end;
 	}
 end
@@ -82,10 +74,19 @@ end
 --- @param id -- The unique ID string.
 --- @param b93 -- Whether or not to use the Base93 format.
 --- @return number -- The index of the unique ID string.
-function UniqueIds:GetIdIndex(bytes: number, id: string, b93: boolean?): number
+function UniqueIds:GetIndexFromId(bytes: number, id: string, b93: boolean?): number
 	return if b93 then Base93.B93ToInt(id) else string.unpack("I" .. bytes, id)
 end
 
+--- Returns the unique ID string of an index.
+--- @param bytes -- The length of the string.
+--- @param index -- The index of the unique ID string.
+--- @param b93 -- Whether or not to use the Base93 format.
+--- @return string -- The unique ID string.
+function UniqueIds:GetIdFromIndex(bytes: number, index: number, b93: boolean?): string
+	return if b93 then Base93.IntToB93(index, bytes) else string.pack("I" .. bytes, index)
+end
+
 --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 
 return UniqueIds