[API Proposal]: `INumberBase.MinValue` and `INumberBase.MaxValue`

[eduherminio]

Background and motivation

When having to initialize T : INumberBase<T> to some default values, theres T.Zero and T.One, but not min and max values.

Unless I'm missing the existence of an interface that has them, maybe INumberBase<T> is a good one to add it.

API Proposal

namespace System.Numerics;

public interface INumberBase<TSelf>
{
    static abstract TSelf MinValue { get; }

    static abstract TSelf MaxValue { get; }
}

API Usage

internal sealed class SPSAAttribute<T> : Attribute
     where T : INumberBase<T>, IMultiplyOperators<T, T, T>, IConvertible, IParsable<T>, ISpanParsable<T>, IDivisionOperators<T, T, T>
{
    public T MinValue { get; }
    public T MaxValue { get; }

    SPSAAttribute()
    {
        MinValue = T.MinValue;
        MaxValue = T.MaxValue;
    }
}

Alternative Designs

No response

Risks

No response

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-numerics
See info in area-owners.md if you want to be subscribed.

[huoyaoyuan]

There is IMinMaxValue<T> for it. INumberBase<T> is not correct because infinite numbers like BigInteger are unbounded.

[eduherminio]

Awesome, I'll use that interface!