System.Numerics polyfills

[dodexahedron]

Provide a link to the method or type you want to polyfill

https://github.com/dotnet/runtime/blob/main/src/libraries/System.Private.CoreLib/src/System/Numerics/BitOperations.cs

Other information

The MS-provided polyfills for System.Numerics are still quite lean and missing some of the most useful stuff like the BitOperations static class.

While the interfaces in that namespace would be nice (even if partially done), they're of course at least not fully possible to polyfill thanks to static virtuals and all that in them. But a lot of those statics are implemented by the BitOperations class anyway, so having that class would be great.

But BitOperations is internal in netstandard2.0 :(

[YoshiRulz]

For now, you can use https://github.com/udaken/Shim.System.Numerics, but see udaken/Shim.System.Numerics#2.

edit: ZstdSharp could use this.