diff --git a/core/src/event/ctx.rs b/core/src/event/ctx.rs
index cf0005e..a16cfd9 100644
--- a/core/src/event/ctx.rs
+++ b/core/src/event/ctx.rs
@@ -2,13 +2,13 @@ use crate::{HasEvents, HasUi, Widget, WidgetRef};
 
 pub struct EventCtx<'a, Rsc: HasEvents, Data> {
     pub state: &'a mut Rsc::State,
-    pub data: &'a mut Data,
+    pub data: Data,
 }
 
 pub struct EventIdCtx<'a, Rsc: HasEvents, Data, W: ?Sized> {
     pub widget: WidgetRef<W>,
     pub state: &'a mut Rsc::State,
-    pub data: &'a mut Data,
+    pub data: Data,
 }
 
 impl<Rsc: HasEvents + HasUi, Data, W: Widget> EventIdCtx<'_, Rsc, Data, W> {
diff --git a/core/src/event/manager.rs b/core/src/event/manager.rs
index 1b08bc6..5876eeb 100644
--- a/core/src/event/manager.rs
+++ b/core/src/event/manager.rs
@@ -28,7 +28,7 @@ impl<Rsc: HasEvents + 'static> EventManager<Rsc> {
         &mut self,
         id: WidgetRef<W>,
         event: E,
-        f: impl for<'a> WidgetEventFn<Rsc, <E::Event as Event>::Data<'a>, W>,
+        f: impl WidgetEventFn<Rsc, <E::Event as Event>::Data, W>,
     ) {
         self.get_type::<E>().register(id, event, f);
         self.widget_to_types
@@ -74,7 +74,7 @@ pub trait EventManagerLike<State> {
     fn undraw(&mut self, data: &ActiveData);
 }
 
-type EventData<Rsc, E> = (E, Rc<dyn for<'a> EventFn<Rsc, <E as Event>::Data<'a>>>);
+type EventData<Rsc, E> = (E, Rc<dyn EventFn<Rsc, <E as Event>::Data>>);
 pub struct TypeEventManager<Rsc: HasEvents, E: Event> {
     // TODO: reduce visiblity!!
     pub active: HashMap<LayerId, HashMap<WidgetId, E::State>>,
@@ -116,18 +116,20 @@ impl<Rsc: HasEvents + 'static, E: Event> TypeEventManager<Rsc, E> {
         &mut self,
         widget: WidgetRef<W>,
         event: impl EventLike<Event = E>,
-        f: impl for<'a> WidgetEventFn<Rsc, E::Data<'a>, W>,
+        f: impl WidgetEventFn<Rsc, E::Data, W>,
     ) {
         let event = event.into_event();
         self.map.entry(widget.id()).or_default().push((
             event,
             Rc::new(move |ctx, rsc| {
-                let mut test = EventIdCtx {
-                    widget,
-                    state: ctx.state,
-                    data: ctx.data,
-                };
-                f(&mut test, rsc);
+                f(
+                    EventIdCtx {
+                        widget,
+                        state: ctx.state,
+                        data: ctx.data,
+                    },
+                    rsc,
+                );
             }),
         ));
     }
@@ -135,15 +137,15 @@ impl<Rsc: HasEvents + 'static, E: Event> TypeEventManager<Rsc, E> {
     pub fn run_fn<'a>(
         &mut self,
         id: impl IdLike,
-    ) -> impl for<'b> FnOnce(EventCtx<'_, Rsc, E::Data<'b>>, &mut Rsc) + 'a {
+    ) -> impl FnOnce(EventCtx<'_, Rsc, E::Data>, &mut Rsc) + 'a {
         let fs = self.map.get(&id.id()).cloned().unwrap_or_default();
         move |ctx, rsc| {
             for (e, f) in fs {
-                if e.should_run(ctx.data) {
+                if let Some(data) = e.should_run(&ctx.data) {
                     f(
-                        &mut EventCtx {
+                        EventCtx {
                             state: ctx.state,
-                            data: ctx.data,
+                            data,
                         },
                         rsc,
                     )
diff --git a/core/src/event/mod.rs b/core/src/event/mod.rs
index 1481eb2..4010969 100644
--- a/core/src/event/mod.rs
+++ b/core/src/event/mod.rs
@@ -7,11 +7,11 @@ pub use manager::*;
 pub use rsc::*;
 
 pub trait Event: Sized + 'static + Clone {
-    type Data<'a> = ();
+    type Data: Clone = ();
     type State: Default = ();
     #[allow(unused_variables)]
-    fn should_run(&self, data: &mut Self::Data<'_>) -> bool {
-        true
+    fn should_run(&self, data: &Self::Data) -> Option<Self::Data> {
+        Some(data.clone())
     }
 }
 
@@ -28,17 +28,17 @@ impl<E: Event> EventLike for E {
     }
 }
 
-pub trait EventFn<Rsc: HasEvents, Data>: Fn(&mut EventCtx<Rsc, Data>, &mut Rsc) + 'static {}
-impl<Rsc: HasEvents, F: Fn(&mut EventCtx<Rsc, Data>, &mut Rsc) + 'static, Data> EventFn<Rsc, Data>
+pub trait EventFn<Rsc: HasEvents, Data>: Fn(EventCtx<Rsc, Data>, &mut Rsc) + 'static {}
+impl<Rsc: HasEvents, F: Fn(EventCtx<Rsc, Data>, &mut Rsc) + 'static, Data> EventFn<Rsc, Data>
     for F
 {
 }
 
 pub trait WidgetEventFn<Rsc: HasEvents, Data, W: ?Sized>:
-    Fn(&mut EventIdCtx<Rsc, Data, W>, &mut Rsc) + 'static
+    Fn(EventIdCtx<Rsc, Data, W>, &mut Rsc) + 'static
 {
 }
-impl<Rsc: HasEvents, F: Fn(&mut EventIdCtx<Rsc, Data, W>, &mut Rsc) + 'static, Data, W: ?Sized>
+impl<Rsc: HasEvents, F: Fn(EventIdCtx<Rsc, Data, W>, &mut Rsc) + 'static, Data, W: ?Sized>
     WidgetEventFn<Rsc, Data, W> for F
 {
 }
diff --git a/core/src/event/rsc.rs b/core/src/event/rsc.rs
index 706cb8f..0ef2ba8 100644
--- a/core/src/event/rsc.rs
+++ b/core/src/event/rsc.rs
@@ -14,7 +14,7 @@ pub trait HasEvents: Sized + HasUi + HasState {
         &mut self,
         id: WidgetRef<W>,
         event: E,
-        f: impl for<'a> WidgetEventFn<Self, <E::Event as Event>::Data<'a>, W>,
+        f: impl WidgetEventFn<Self, <E::Event as Event>::Data, W>,
     ) {
         self.events_mut().register(id, event, f);
     }
@@ -24,7 +24,7 @@ pub trait RunEvents: HasEvents {
     fn run_event<E: EventLike>(
         &mut self,
         id: impl IdLike,
-        data: &mut <E::Event as Event>::Data<'_>,
+        data: <E::Event as Event>::Data,
         state: &mut Self::State,
     ) {
         let f = self.events_mut().get_type::<E>().run_fn(id);
diff --git a/core/src/widget/handle.rs b/core/src/widget/handle.rs
index 9ea1302..3de2b73 100644
--- a/core/src/widget/handle.rs
+++ b/core/src/widget/handle.rs
@@ -171,3 +171,4 @@ fn null_ptr<W: ?Sized>() -> *const W {
 }
 
 unsafe impl<W: ?Sized> Send for WidgetRef<W> {}
+unsafe impl<W: ?Sized> Sync for WidgetRef<W> {}
diff --git a/examples/tabs/main.rs b/examples/tabs/main.rs
index 6ee99fc..6bb1e37 100644
--- a/examples/tabs/main.rs
+++ b/examples/tabs/main.rs
@@ -2,7 +2,8 @@ use cosmic_text::Family;
 use std::{cell::RefCell, rc::Rc};
 use winit::event::WindowEvent;
 
-iris::state_prelude!(DefaultRsc<Client>);
+use iris::prelude::*;
+type ClientRsc = DefaultRsc<Client>;
 
 fn main() {
     DefaultApp::<Client>::run();
@@ -119,6 +120,7 @@ impl DefaultAppState for Client {
                 texts(rsc).push(msg_box);
             })
             .add(rsc);
+
         let text_edit_scroll = (
             msg_area.height(rest(1)),
             (
@@ -126,8 +128,8 @@ impl DefaultAppState for Client {
                 (
                     add_text.width(rest(1)),
                     Rect::new(Color::GREEN)
-                        .on(CursorSense::click(), move |ctx, rsc| {
-                            rsc.run_event::<Submit>(add_text, &mut (), ctx.state);
+                        .on(CursorSense::click(), move |ctx, rsc: &mut ClientRsc| {
+                            rsc.run_event::<Submit>(add_text, (), ctx.state);
                         })
                         .sized((40, 40)),
                 )
diff --git a/examples/task.rs b/examples/task.rs
index 7860e50..4503ead 100644
--- a/examples/task.rs
+++ b/examples/task.rs
@@ -1,7 +1,6 @@
+use iris::prelude::*;
 use std::time::Duration;
 
-iris::state_prelude!(DefaultRsc<State>);
-
 fn main() {
     DefaultApp::<State>::run();
 }
@@ -14,17 +13,15 @@ struct State {
 impl DefaultAppState for State {
     fn new(ui_state: DefaultUiState, rsc: &mut DefaultRsc<Self>, _: Proxy<Self::Event>) -> Self {
         let rect = rect(Color::RED).add(rsc);
-        rect.on(CursorSense::click(), move |_, rsc| {
-            rsc.tasks.spawn(async move |ctx| {
-                tokio::time::sleep(Duration::from_secs(1)).await;
-                ctx.update(move |_, rsc| {
-                    let rect = rect(rsc);
-                    if rect.color == Color::RED {
-                        rect.color = Color::GREEN;
-                    } else {
-                        rect.color = Color::RED;
-                    }
-                });
+        rect.task_on(CursorSense::click(), async move |mut ctx| {
+            tokio::time::sleep(Duration::from_secs(1)).await;
+            ctx.task.update(move |_, rsc| {
+                let rect = rect(rsc);
+                if rect.color == Color::RED {
+                    rect.color = Color::GREEN;
+                } else {
+                    rect.color = Color::RED;
+                }
             });
         })
         .set_root(rsc);
diff --git a/src/default/mod.rs b/src/default/mod.rs
index 1e9819a..9c56660 100644
--- a/src/default/mod.rs
+++ b/src/default/mod.rs
@@ -127,6 +127,12 @@ impl<State: 'static> HasEvents for DefaultRsc<State> {
     }
 }
 
+impl<State: 'static> HasTasks for DefaultRsc<State> {
+    fn tasks_mut(&mut self) -> &mut Tasks<Self> {
+        &mut self.tasks
+    }
+}
+
 pub struct DefaultApp<State: DefaultAppState> {
     rsc: DefaultRsc<State>,
     state: State,
@@ -169,7 +175,7 @@ impl<State: DefaultAppState> AppState for DefaultApp<State> {
         if input_changed {
             let window_size = ui_state.window_size();
             self.rsc
-                .run_sensors(&mut self.state, &cursor_state, window_size);
+                .run_sensors(&mut self.state, cursor_state, window_size);
         }
         let ui = &mut self.rsc.ui;
         let ui_state = self.state.default_state_mut();
@@ -200,13 +206,13 @@ impl<State: DefaultAppState> AppState for DefaultApp<State> {
                             ui_state.window.set_ime_allowed(false);
                         }
                         TextInputResult::Submit => {
-                            self.rsc.run_event::<Submit>(sel, &mut (), &mut self.state);
+                            self.rsc.run_event::<Submit>(sel, (), &mut self.state);
                         }
                         TextInputResult::Paste => {
                             if let Ok(t) = ui_state.clipboard.get_text() {
                                 text.insert(&t);
                             }
-                            self.rsc.run_event::<Edited>(sel, &mut (), &mut self.state);
+                            self.rsc.run_event::<Edited>(sel, (), &mut self.state);
                         }
                         TextInputResult::Copy(text) => {
                             if let Err(err) = ui_state.clipboard.set_text(text) {
@@ -214,7 +220,7 @@ impl<State: DefaultAppState> AppState for DefaultApp<State> {
                             }
                         }
                         TextInputResult::Used => {
-                            self.rsc.run_event::<Edited>(sel, &mut (), &mut self.state);
+                            self.rsc.run_event::<Edited>(sel, (), &mut self.state);
                         }
                         TextInputResult::Unused => {}
                     }
diff --git a/src/default/sense.rs b/src/default/sense.rs
index 871cf48..db88abd 100644
--- a/src/default/sense.rs
+++ b/src/default/sense.rs
@@ -26,14 +26,15 @@ pub enum CursorSense {
 pub struct CursorSenses(Vec<CursorSense>);
 
 impl Event for CursorSenses {
-    type Data<'a> = CursorData<'a>;
+    type Data = CursorData;
     type State = SensorState;
-    fn should_run(&self, data: &mut Self::Data<'_>) -> bool {
-        if let Some(sense) = should_run(self, data.cursor, data.hover) {
+    fn should_run(&self, data: &Self::Data) -> Option<Self::Data> {
+        if let Some(sense) = should_run(self, &data.cursor, data.hover) {
+            let mut data = data.clone();
             data.sense = sense;
-            true
+            Some(data)
         } else {
-            false
+            None
         }
     }
 }
@@ -127,23 +128,24 @@ pub struct SensorState {
     pub hover: ActivationState,
 }
 
-pub struct CursorData<'a> {
+#[derive(Clone)]
+pub struct CursorData {
     /// where this widget was hit
     pub pos: Vec2,
     pub size: Vec2,
     pub scroll_delta: Vec2,
     pub hover: ActivationState,
-    pub cursor: &'a CursorState,
+    pub cursor: CursorState,
     /// the first sense that triggered this
     pub sense: CursorSense,
 }
 
 pub trait SensorUi<Rsc: HasEvents> {
-    fn run_sensors(&mut self, state: &mut Rsc::State, cursor: &CursorState, window_size: Vec2);
+    fn run_sensors(&mut self, state: &mut Rsc::State, cursor: CursorState, window_size: Vec2);
 }
 
 impl<Rsc: HasEvents> SensorUi<Rsc> for Rsc {
-    fn run_sensors(&mut self, state: &mut Rsc::State, cursor: &CursorState, window_size: Vec2) {
+    fn run_sensors(&mut self, state: &mut Rsc::State, cursor: CursorState, window_size: Vec2) {
         let layers = std::mem::take(&mut self.ui_mut().layers);
         let mut active = std::mem::take(&mut self.events_mut().get_type::<CursorSense>().active);
         for layer in layers.indices().rev() {
@@ -158,7 +160,9 @@ impl<Rsc: HasEvents> SensorUi<Rsc> for Rsc {
                 }
                 sensed = true;
 
-                let mut data = CursorData {
+                let cursor = cursor.clone();
+
+                let data = CursorData {
                     pos: cursor.pos - region.top_left,
                     size: region.bot_right - region.top_left,
                     scroll_delta: cursor.scroll_delta,
@@ -168,7 +172,7 @@ impl<Rsc: HasEvents> SensorUi<Rsc> for Rsc {
                     // might wanna set up Event to have a prepare stage
                     sense: CursorSense::Hovering,
                 };
-                self.run_event::<CursorSense>(*id, &mut data, state);
+                self.run_event::<CursorSense>(*id, data, state);
             }
             if sensed {
                 break;
diff --git a/src/default/task.rs b/src/default/task.rs
index 51f6a66..36b55c1 100644
--- a/src/default/task.rs
+++ b/src/default/task.rs
@@ -62,17 +62,14 @@ impl<Rsc: HasState> Tasks<Rsc> {
         )
     }
 
-    pub fn spawn<F: for<'a> AsyncFnOnce(&'a mut TaskCtx<Rsc>) + 'static + std::marker::Send>(
-        &mut self,
-        task: F,
-    ) where
-        for<'a> <F as AsyncFnOnce<(&'a mut TaskCtx<Rsc>,)>>::CallOnceFuture: Send,
+    pub fn spawn<F: AsyncFnOnce(TaskCtx<Rsc>) + 'static + std::marker::Send>(&mut self, task: F)
+    where
+        F::CallOnceFuture: Send,
     {
         let send = self.msg_send.clone();
         let window = self.window.clone();
         let _ = self.start.send(Box::pin(async move {
-            let mut ctx = TaskCtx::new(send);
-            task(&mut ctx).await;
+            task(TaskCtx::new(send)).await;
             window.request_redraw();
         }));
     }
diff --git a/src/event.rs b/src/event.rs
index f8960ea..5cd0691 100644
--- a/src/event.rs
+++ b/src/event.rs
@@ -1,54 +1,60 @@
 use iris_core::*;
 use iris_macro::*;
+use std::sync::Arc;
 
 use crate::default::{TaskCtx, Tasks};
 
-pub mod eventable {
-    use super::*;
-    widget_trait! {
-        pub trait Eventable<Rsc: HasEvents>;
-        fn on<E: EventLike>(
-            self,
-            event: E,
-            f: impl for<'a> WidgetEventFn<Rsc, <E::Event as Event>::Data<'a>, WL::Widget>,
-        ) -> impl WidgetIdFn<Rsc, WL::Widget> {
-            move |rsc| {
-                let id = self.add(rsc);
-                rsc.register_event(id, event.into_event(), move |ctx, rsc| {
-                    f(&mut EventIdCtx {
+pub trait Eventable<Rsc: HasEvents, Tag>: WidgetLike<Rsc, Tag> {
+    fn on<E: EventLike>(
+        self,
+        event: E,
+        f: impl WidgetEventFn<Rsc, <E::Event as Event>::Data, Self::Widget>,
+    ) -> impl WidgetIdFn<Rsc, Self::Widget> {
+        move |rsc| {
+            let id = self.add(rsc);
+            rsc.register_event(id, event.into_event(), move |ctx, rsc| {
+                f(
+                    EventIdCtx {
                         widget: id,
                         state: ctx.state,
                         data: ctx.data,
-                    }, rsc);
-                });
-                id
-            }
+                    },
+                    rsc,
+                );
+            });
+            id
         }
     }
+}
+impl<WL: WidgetLike<Rsc, Tag>, Rsc: HasEvents, Tag> Eventable<Rsc, Tag> for WL {}
 
-    // widget_trait! {
-    //     pub trait TaskEventable<Rsc: HasEvents + HasTasks>;
-    //     fn task_on<E: EventLike>(
-    //         self,
-    //         event: E,
-    //         f: impl for<'a> AsyncWidgetEventFn<Rsc, <E::Event as Event>::Data<'a>, WL::Widget>,
-    //     ) -> impl WidgetIdFn<Rsc, WL::Widget> {
-    //         move |rsc| {
-    //             let id = self.add(rsc);
-    //             rsc.register_event(id, event.into_event(), move |ctx, rsc| {
-    //                 rsc.tasks_mut().spawn(async move |task| {
-    //                     f(&mut AsyncEventIdCtx {
-    //                         widget: id,
-    //                         state: ctx.state,
-    //                         data: ctx.data,
-    //                         task,
-    //                     }, rsc).await;
-    //                 });
-    //             });
-    //             id
-    //         }
-    //     }
-    // }
+widget_trait! {
+    pub trait TaskEventable<Rsc: HasEvents + HasTasks>;
+    fn task_on<E: EventLike, F: AsyncWidgetEventFn<Rsc, <E::Event as Event>::Data, WL::Widget>>(
+        self,
+        event: E,
+        f: F,
+    ) -> impl WidgetIdFn<Rsc, WL::Widget>
+        where <E::Event as Event>::Data: Send,
+        for<'a> F::CallRefFuture<'a>: Send,
+    {
+        let f = Arc::new(f);
+        move |rsc| {
+            let id = self.add(rsc);
+            rsc.register_event(id, event.into_event(), move |ctx, rsc| {
+                let data = ctx.data;
+                let f = f.clone();
+                rsc.tasks_mut().spawn(async move |task| {
+                    f(AsyncEventIdCtx {
+                        widget: id,
+                        data,
+                        task,
+                    }).await;
+                });
+            });
+            id
+        }
+    }
 }
 
 pub trait HasTasks: Sized + HasState + HasEvents {
@@ -56,21 +62,20 @@ pub trait HasTasks: Sized + HasState + HasEvents {
 }
 
 pub trait AsyncWidgetEventFn<Rsc: HasEvents, Data, W: ?Sized>:
-    AsyncFn(&mut AsyncEventIdCtx<Rsc, Data, W>, &mut Rsc) + 'static
+    AsyncFn(AsyncEventIdCtx<Rsc, Data, W>) + Send + Sync + 'static
 {
 }
 impl<
     Rsc: HasEvents,
-    F: AsyncFn(&mut AsyncEventIdCtx<Rsc, Data, W>, &mut Rsc) + 'static,
+    F: AsyncFn(AsyncEventIdCtx<Rsc, Data, W>) + Send + Sync + 'static,
     Data,
     W: ?Sized,
 > AsyncWidgetEventFn<Rsc, Data, W> for F
 {
 }
 
-pub struct AsyncEventIdCtx<'a, Rsc: HasEvents, Data, W: ?Sized> {
+pub struct AsyncEventIdCtx<Rsc: HasEvents, Data, W: ?Sized> {
     pub widget: WidgetRef<W>,
-    pub state: &'a mut Rsc::State,
-    pub data: &'a mut Data,
-    pub task: &'a mut TaskCtx<Rsc>,
+    pub data: Data,
+    pub task: TaskCtx<Rsc>,
 }
diff --git a/src/lib.rs b/src/lib.rs
index 81f1a3e..fa54bba 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,25 +8,11 @@
 
 pub mod default;
 pub mod event;
-pub mod typed;
 pub mod widget;
 
 pub use iris_core as core;
 pub use iris_macro as macros;
 
-#[macro_export]
-macro_rules! state_prelude {
-    ($vis:vis $state:ty) => {
-        iris::event_state!($vis $state);
-        $vis use iris::{
-            default::*,
-            core::{len_fns::*, util::Vec2, *},
-            macros::*,
-            widget::*,
-        };
-    };
-}
-
 pub mod prelude {
     use super::*;
     pub use default::*;
@@ -36,5 +22,5 @@ pub mod prelude {
     pub use widget::*;
 
     pub use iris_core::util::Vec2;
-    pub use typed::*;
+    pub use len_fns::*;
 }
diff --git a/src/typed.rs b/src/typed.rs
deleted file mode 100644
index d22d8fb..0000000
--- a/src/typed.rs
+++ /dev/null
@@ -1,37 +0,0 @@
-#[macro_export]
-macro_rules! event_state {
-    ($vis:vis $rsc:ty) => {
-        mod local_event_trait {
-            use super::*;
-            #[allow(unused_imports)]
-            use $crate::prelude::*;
-            pub trait EventableCtx<WL: WidgetLike<$rsc, Tag>, Tag> {
-                fn on<E: EventLike>(
-                    self,
-                    event: E,
-                    f: impl for<'a> WidgetEventFn<
-                        $rsc,
-                        <E::Event as Event>::Data<'a>,
-                        WL::Widget
-                    >,
-                ) -> impl WidgetIdFn<$rsc, WL::Widget>;
-            }
-            impl<WL: WidgetLike<$rsc, Tag>, Tag> EventableCtx<WL, Tag> for WL {
-                fn on<E: EventLike>(
-                    self,
-                    event: E,
-                    f: impl for<'a> WidgetEventFn<
-                        $rsc,
-                        <E::Event as Event>::Data<'a>,
-                        WL::Widget
-                    >,
-                ) -> impl WidgetIdFn<$rsc, WL::Widget> {
-                    eventable::Eventable::on(self, event, f)
-                }
-            }
-        }
-        $vis type EventManager = $crate::prelude::EventManager<<$rsc as HasState>::State>;
-        $vis use local_event_trait::*;
-    };
-}
-pub use event_state;
diff --git a/src/widget/trait_fns.rs b/src/widget/trait_fns.rs
index 594cc98..b526d40 100644
--- a/src/widget/trait_fns.rs
+++ b/src/widget/trait_fns.rs
@@ -84,7 +84,6 @@ widget_trait! {
     }
 
     fn scrollable(self) -> impl WidgetIdFn<Rsc, Scroll> where Rsc: HasEvents {
-        use eventable::Eventable;
         move |state| {
             Scroll::new(self.add_strong(state), Axis::Y)
                 .on(CursorSense::Scroll, |ctx, rsc| {
@@ -132,9 +131,9 @@ widget_trait! {
     }
 }
 
-pub trait CoreWidgetArr<State, const LEN: usize, Wa: WidgetArrLike<State, LEN, Tag>, Tag> {
-    fn span(self, dir: Dir) -> SpanBuilder<State, LEN, Wa, Tag>;
-    fn stack(self) -> StackBuilder<State, LEN, Wa, Tag>;
+pub trait CoreWidgetArr<Rsc, const LEN: usize, Wa: WidgetArrLike<Rsc, LEN, Tag>, Tag> {
+    fn span(self, dir: Dir) -> SpanBuilder<Rsc, LEN, Wa, Tag>;
+    fn stack(self) -> StackBuilder<Rsc, LEN, Wa, Tag>;
 }
 
 impl<State, const LEN: usize, Wa: WidgetArrLike<State, LEN, Tag>, Tag>