diff --git a/packages/ipc/src/ipc.ts b/packages/ipc/src/ipc.ts
index d84174f..0189a55 100644
--- a/packages/ipc/src/ipc.ts
+++ b/packages/ipc/src/ipc.ts
@@ -196,13 +196,15 @@ export class IPC {
     }
   }
 
-  once<T>(channel: string, handler: (data: T) => void): () => void {
+  once<T>(channel: string, handler: (data: T) => void): () => void
+  once<T>(channel: string, handler: (data: T) => void, options: OnOptions<T>): () => void
+  once<T>(channel: string, handler: (data: T) => void, options?: OnOptions<T>): () => void {
     let off: () => void
     const wrapped = (data: T): void => {
       off()
       handler(data)
     }
-    off = this.on(channel, wrapped)
+    off = options ? this.on(channel, wrapped, options) : this.on(channel, wrapped)
     return off
   }
 
diff --git a/packages/ipc/test/__snapshots__/tsnapi/@mcbe-mods/ipc/index.snapshot.d.ts b/packages/ipc/test/__snapshots__/tsnapi/@mcbe-mods/ipc/index.snapshot.d.ts
index 6586dde..da31d8d 100644
--- a/packages/ipc/test/__snapshots__/tsnapi/@mcbe-mods/ipc/index.snapshot.d.ts
+++ b/packages/ipc/test/__snapshots__/tsnapi/@mcbe-mods/ipc/index.snapshot.d.ts
@@ -61,6 +61,7 @@ export declare class IPC {
   on<T>(_: string, _: (_: T) => void): () => void;
   on<T>(_: string, _: (_: T) => void, _: OnOptions<T>): () => void;
   once<T>(_: string, _: (_: T) => void): () => void;
+  once<T>(_: string, _: (_: T) => void, _: OnOptions<T>): () => void;
 }
 // #endregion
 
diff --git a/packages/ipc/test/__snapshots__/tsnapi/@mcbe-mods/ipc/index.snapshot.js b/packages/ipc/test/__snapshots__/tsnapi/@mcbe-mods/ipc/index.snapshot.js
index 3166165..e873517 100644
--- a/packages/ipc/test/__snapshots__/tsnapi/@mcbe-mods/ipc/index.snapshot.js
+++ b/packages/ipc/test/__snapshots__/tsnapi/@mcbe-mods/ipc/index.snapshot.js
@@ -23,7 +23,7 @@ export class IPC {
   dispose() {}
   send(_, _, _) {}
   on(_, _, _) {}
-  once(_, _) {}
+  once(_, _, _) {}
   channelUrl(_, _) {}
   sendBody(_, _, _) {}
   handleReceive(_, _) {}
diff --git a/packages/ipc/test/ipc.test.ts b/packages/ipc/test/ipc.test.ts
index 7fd4b41..a827aab 100644
--- a/packages/ipc/test/ipc.test.ts
+++ b/packages/ipc/test/ipc.test.ts
@@ -92,6 +92,24 @@ describe('IPC', () => {
       simulateReceive(url('test'), '42')
       expect(handler).not.toHaveBeenCalled()
     })
+
+    it('supports custom deserializer', () => {
+      const handler = vi.fn()
+      const deserializer = {
+        deserialize: (d: string) => Number.parseInt(d.replace('num:', ''), 10),
+      }
+      ipc.once('custom', handler, { deserializer })
+      simulateReceive(url('custom'), 'num:42')
+      expect(handler).toHaveBeenCalledWith(42)
+    })
+
+    it('with custom deserializer fires only once', () => {
+      const handler = vi.fn()
+      ipc.once('test', handler, { deserializer: { deserialize: (d: string) => d } })
+      simulateReceive(url('test'), 'a')
+      simulateReceive(url('test'), 'b')
+      expect(handler).toHaveBeenCalledTimes(1)
+    })
   })
 
   it('chunks large payloads', () => {
diff --git a/packages/utils/README.md b/packages/utils/README.md
index 905e03c..b5253ef 100644
--- a/packages/utils/README.md
+++ b/packages/utils/README.md
@@ -16,14 +16,14 @@ npm install @mcbe-mods/utils
 ```
 
 ```ts
-import { Base64, color, Experience, getCubeRange, getRandomProbability, getRandomRangeValue, getSphereRange, ms2ticks, splitGroups, unique } from '@mcbe-mods/utils'
+import { Base64, Color, Experience, getCubeRange, getRandomProbability, getRandomRangeValue, getSphereRange, ms2ticks, splitGroups, unique } from '@mcbe-mods/utils'
 
 // splitGroups - split items into stacks
 splitGroups(65) // => [64, 1]
 splitGroups(140) // => [64, 64, 12]
 
-// color - Minecraft formatting codes
-color.green.italic.bold('Dedicated Ser') + color.reset('ver') + color.red.obfuscated('!!!')
+// Color - Minecraft formatting codes
+Color.green.italic.bold('Dedicated Ser') + Color.reset('ver') + Color.red.obfuscated('!!!')
 // => '§a§o§lDedicated Ser§rver§c§k!!!'
 
 // Experience - player XP calculation
@@ -44,7 +44,7 @@ getSphereRange({ x: 0, y: 0, z: 0 }, 1) // => 27 positions (sphere)
 | Function | Description |
 | --- | --- |
 | `splitGroups(sum, groupSize?)` | Split a number into groups of a given size |
-| `color` | Minecraft color/formatting code stylizer |
+| `Color` | Minecraft color/formatting code stylizer |
 | `Experience` | Player experience calculator (leveling up) |
 | `ms2ticks(ms?, ticksPerSec?, msPerSec?)` | Convert real time to game ticks |
 | `getCubeRange(location, radius?)` | Get block positions in a cube |
diff --git a/packages/utils/test/getRadiusRange.test.ts b/packages/utils/test/range.test.ts
similarity index 100%
rename from packages/utils/test/getRadiusRange.test.ts
rename to packages/utils/test/range.test.ts