/// <summary>
/// Decode a double into its sign, mantissa, and exponent.
/// </summary>
internal static bool Decode(double value, out ulong mantissa, out uint exponent)
{
ulong bits = RyuUtils.double_to_bits(value);
mantissa = bits & MANTISSA_MASK;
exponent = (uint)(bits >> DOUBLE_MANTISSA_BITS) & EXPONENT_MASK;
return((bits & SIGN_MASK) != 0U);
}