internal InvalidConversionException(DataVersion v) : base($"Version is alerady {v.S()}.") { }
internal ConversionException(string msg, ref Block block, DataVersion v) : base($"{msg} Block: {block} Version: {v.S()}") { }
internal InvalidConversionException(DataVersion from, DataVersion to) : base($"Cannot convert from {from.S()} to {to.S()}.") { }