diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index cb6a3c2..d02e659 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -2,8 +2,7 @@ name: Release
 
 on:
   release:
-    types:
-      - published
+    types: [published]
 
 jobs:
   release:
@@ -20,10 +19,7 @@ jobs:
       - name: Build model
         run: rojo build -o charm.rbxm
 
-      - name: Upload release
-        uses: softprops/action-gh-release@v2
-        if: ${{ github.event.release }}
+      - uses: AButler/upload-release-assets@v3.0
         with:
-          files: charm.rbxm
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          files: "charm.rbxm"
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/images/logo.png b/images/logo.png
index 7f4915e..22041c7 100644
Binary files a/images/logo.png and b/images/logo.png differ
diff --git a/src/atom.luau b/src/atom.luau
index 4d87a7e..17eb224 100644
--- a/src/atom.luau
+++ b/src/atom.luau
@@ -17,7 +17,7 @@ export type Atom<T> = (() -> T) & ((state: T | ((T) -> T)) -> ()) & {
 	get: ((self: Atom<T>) -> T) & (<Result>(self: Atom<T>, selector: (T) -> Result) -> Result),
 	set: (self: Atom<T>, state: T | ((T) -> T)) -> (),
 	memo: (self: Atom<T>, equalityFn: (previous: T, current: T) -> boolean) -> Atom<T>,
-	writable: (self: Atom<T>, setter: ((update: T, previous: T) -> T?) & (update: T, previous: T) -> ()) -> Atom<T>,
+	writable: (self: Atom<T>, onSet: ((update: T, previous: T) -> T?) & (update: T, previous: T) -> ()) -> Atom<T>,
 	readonly: (self: Atom<T>) -> ReadonlyAtom<T>,
 	named: (self: Atom<T>, label: string) -> Atom<T>,
 	unmount: (self: Atom<T>) -> (),
@@ -26,9 +26,8 @@ export type Atom<T> = (() -> T) & ((state: T | ((T) -> T)) -> ()) & {
 export type ReadonlyAtom<T> = (() -> T) & {
 	get: ((self: ReadonlyAtom<T>) -> T) & (<Result>(self: ReadonlyAtom<T>, selector: (T) -> Result) -> Result),
 	memo: (self: ReadonlyAtom<T>, equalityFn: (previous: T, current: T) -> boolean) -> ReadonlyAtom<T>,
-	writable: ((self: Atom<T>) -> Atom<T>) & (
-		(self: Atom<T>, setter: ((update: T, previous: T) -> T?) & (update: T, previous: T) -> ()) -> Atom<T>
-	),
+	writable: ((self: Atom<T>) -> Atom<T>)
+		& ((self: Atom<T>, onSet: ((update: T, previous: T) -> T?) & (update: T, previous: T) -> ()) -> Atom<T>),
 	readonly: (self: ReadonlyAtom<T>) -> ReadonlyAtom<T>,
 	named: (self: ReadonlyAtom<T>, label: string) -> ReadonlyAtom<T>,
 	unmount: (self: ReadonlyAtom<T>) -> (),
@@ -97,8 +96,8 @@ local function atom<State>(state: State): Atom<State>
 		return self
 	end
 
-	function atom:writable(setterFn: ((State, State) -> State?)?): Atom<State>
-		setter = setterFn
+	function atom:writable(onSet: ((State, State) -> State?)?): Atom<State>
+		setter = onSet
 		return self
 	end
 
diff --git a/src/derive.luau b/src/derive.luau
index 2b40c88..6a62f41 100644
--- a/src/derive.luau
+++ b/src/derive.luau
@@ -16,7 +16,6 @@ local function derive<Result>(...): ReadonlyAtom<Result>
 	local atoms: { Atom<unknown> } = { ... }
 	local combiner: (...unknown) -> Result = table.remove(atoms) :: any
 	local size = #atoms
-
 	local dependencies: { unknown } = {}
 
 	for index, atom in atoms do
diff --git a/src/react/useAtomState.luau b/src/react/useAtomState.luau
index 9deebbc..bcedd38 100644
--- a/src/react/useAtomState.luau
+++ b/src/react/useAtomState.luau
@@ -6,7 +6,7 @@ type Atom<T> = atom.Atom<T>
 type UseAtomState =
 	(<State>(atom: Atom<State>) -> State)
 	& (<State, Result>(atom: Atom<State>, ((State) -> Result)?) -> State | Result)
-	& <State, Result>(atom: Atom<State>, selector: (State) -> Result) -> Result
+	& (<State, Result>(atom: Atom<State>, selector: (State) -> Result) -> Result)
 
 local function useAtomState<State>(atom: Atom<State>, selector: ((State) -> State)?): State
 	local state, setState = React.useState(function()
diff --git a/src/split.luau b/src/split.luau
index 285c18f..6152c3a 100644
--- a/src/split.luau
+++ b/src/split.luau
@@ -55,9 +55,10 @@ local function split<Item, Key>(
 
 		for key, item in previousItems do
 			local id = if keyExtractor then keyExtractor(item) else key
+			local atom = atoms[id]
 
-			if itemsByKeys[id] == nil then
-				atoms[id]:unmount()
+			if itemsByKeys[id] == nil and atom then
+				atom:unmount()
 				atoms[id] = nil
 			end
 		end
diff --git a/src/subscribe.luau b/src/subscribe.luau
index 30af236..be2b074 100644
--- a/src/subscribe.luau
+++ b/src/subscribe.luau
@@ -3,7 +3,7 @@ type Atom<T> = atom.Atom<T>
 
 local reference = require(script.Parent.utils.reference)
 
-local function subscribe<State>(atom: Atom<State>, callback: (state: State, lastState: State) -> ()): (() -> (), () -> ())
+local function subscribe<State>(atom: Atom<State>, callback: (state: State, previous: State) -> ()): (() -> (), () -> ())
 	local pending: thread? = nil
 	local state = atom:get()