fix: make miri pass on context api

packages/core/src/bump_frame.rs

@@ -1,9 +1,9 @@
 use crate::nodes::RenderReturn;
 use bumpalo::Bump;
-use std::cell::Cell;
+use std::cell::{Cell, UnsafeCell};
 
 pub(crate) struct BumpFrame {
-    pub bump: Bump,
+    pub bump: UnsafeCell<Bump>,
     pub node: Cell<*const RenderReturn<'static>>,
 }
 
@@ -11,7 +11,7 @@ impl BumpFrame {
     pub(crate) fn new(capacity: usize) -> Self {
         let bump = Bump::with_capacity(capacity);
         Self {
-            bump,
+            bump: UnsafeCell::new(bump),
             node: Cell::new(std::ptr::null()),
         }
     }
@@ -26,4 +26,11 @@ impl BumpFrame {
 
         unsafe { std::mem::transmute(&*node) }
     }
+
+    pub(crate) fn bump(&self) -> &Bump {
+        unsafe { &*self.bump.get() }
+    }
+    pub(crate) unsafe fn bump_mut(&self) -> &mut Bump {
+        unsafe { &mut *self.bump.get() }
+    }
 }