HexConverter.cs

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using System.Runtime.CompilerServices;
 
namespace System;
 
internal static class HexConverter
{
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static char ToCharUpper(int value)
    {
        value &= 0xF;
        value += 48;
        if (value > 57)
        {
            value += 7;
        }
        return (char)value;
    }
}