Feature Request LayerMask and Bit Twiddling - a Suggestion

After seeing a few threads with confusion over LayerMask bit-twiddling, and the difference between layer NUMBER and layer MASK concepts, I thought I'd share a little snippet from my collection, which I still wish would be added to the official API.

Code (CSharp):

1. using UnityEngine;
2. using System.Runtime.CompilerServices;
3.  
4. public static class HalleysTotallyCoolUnityExtensionMethods
5. {
6.     // ...
7.  
8.     [MethodImpl(MethodImplOptions.AggressiveInlining)]
9.     public static LayerMask WithLayer(this LayerMask mask, int layer)
10.     {
11.         return mask.value | (1 << layer);
12.     }
13.     [MethodImpl(MethodImplOptions.AggressiveInlining)]
14.     public static LayerMask WithoutLayer(this LayerMask mask, int layer)
15.     {
16.         return mask.value & ~(1 << layer);
17.     }
18.  
19.     public static LayerMask WithLayer(this LayerMask mask, string layer)
20.     {
21.         return mask.value | LayerMask.GetMask(layer);
22.     }
23.  
24.     public static LayerMask WithoutLayer(this LayerMask mask, string layer)
25.     {
26.         return mask.value & ~LayerMask.GetMask(layer);
27.     }
28.  
29.     // ...
30. }
31.  

Thanks to the way LayerMask already implicitly allows for conversions to the integer type, these functions can easily stack and interoperate.

Code (CSharp):

1.  
2.     public LayerMask myMask;
3.     // ...
4.     myMask = myMask.WithoutLayer(6).WithoutLayer("Ignore Raycast");
5.