/// <summary>
/// Get a string description of an error code.
/// </summary>
/// <param name="errorNum">
/// The <see cref="CurlMultiCode" /> for which to obtain the error
/// string description.
/// </param>
/// <returns>The string description.</returns>
public string StrError(CurlMultiCode errorNum) => Marshal.PtrToStringAnsi(NativeMethods.curl_multi_strerror(errorNum));