Add BitOperations.IsPow2 polyfill (#575) - #577
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Recreates System.Numerics.BitOperations on targets before netcoreapp3.0, and adds the missing IsPow2 overloads as static extension members where the type exists but the overloads do not (IsPow2 landed in net6.0, its nint/nuint overloads in net7.0).
This was referenced Aug 12, 2026
This was referenced Aug 12, 2026
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Recreates System.Numerics.BitOperations on targets before netcoreapp3.0, and adds the missing IsPow2 overloads as static extension members where the type exists but the overloads do not (IsPow2 landed in net6.0, its nint/nuint overloads in net7.0).