Use generalized iteration everywhere

Closes #55

src/apply.luau

@@ -133,8 +133,8 @@ local function apply<T>(instance: T & Instance, properties: { [unknown]: unknown
         ;(instance :: any)[event_name]:Connect(event_listener)
     end
 
-    for _, queued in next, actions do
+    for _, queued in actions do
-        for _, callback in next, queued do
+        for _, callback in queued do
             callback(instance)
         end
     end
@@ -149,7 +149,7 @@ local function apply<T>(instance: T & Instance, properties: { [unknown]: unknown
     end
 
     table.clear(events)
-    for _, queued in next, actions do table.clear(queued) end
+    for _, queued in actions do table.clear(queued) end
     caches.parent = nil
     if flags.strict then table.clear(nested_debug) end
     table.clear(nested_stack)

src/graph.luau

@@ -93,7 +93,7 @@ end
 
 local function flush_cleanups<T>(node: Node<T>)
     if node.cleanups then
-        for _, fn in next, node.cleanups do
+        for _, fn in node.cleanups do
             local ok, err: string? = xpcall(fn, debug.traceback)
             if not ok then error(`cleanup error: {err}`, 0) end
         end

src/implicit_effect.luau

@@ -47,7 +47,7 @@ local function update_children_effect(p: {
                 cur_children_set[child] = nil -- remove child from cache if it was already in cache
             end  
         elseif type(child) == "table" then
-            for _, child in next, child do
+            for _, child in child do
                 process_child(child)
             end
         elseif type(child) == "function" then
@@ -70,7 +70,7 @@ local function update_children_effect(p: {
 
     process_child(new_children)
 
-    for child in next, cur_children_set do
+    for child in cur_children_set do
         child.Parent = nil -- unparent all children that weren't in the new children set
     end
 

src/spring.luau

@@ -233,7 +233,7 @@ local function spring<T>(source: () -> T, period: number?, damping_ratio: number
 end
 
 local function step_springs(dt: number)
-    for data in next, springs do
+    for data in springs do
         local k, c,
         x0_123, x1_123, u_123,
         x0_456, x1_456, u_456 =