/// <summary>
        /// Compares two strings.
        /// </summary>
        /// <param name="a">The first string to compare.</param>
        /// <param name="b">The second string to compare.</param>
        /// <returns>True if the strings are equal.</returns>
        public bool Equals(ISpanString a, ISpanString b)
        {
            // Find optimized comparison methods.
            if (a is SpanString1 a1)
            {
                if (b is SpanString1 b1)
                {
                    return(_ignoreCase ? SpanString1.EqualsIgnoreCase(a1, b1) : SpanString1.Equals(a1, b1));
                }

                if (b is SpanString2 b2)
                {
                    return(_ignoreCase ? SpanString1.EqualsIgnoreCase(a1, b2) : SpanString1.Equals(a1, b2));
                }

                throw new ArgumentException($"Second param 'b' is an unknown SpanString type '{b.GetType().Name}', is this a bug?");
            }

            if (a is SpanString2 a2)
            {
                if (b is SpanString1 b1)
                {
                    return(_ignoreCase ? SpanString2.EqualsIgnoreCase(a2, b1) : SpanString2.Equals(a2, b1));
                }

                if (b is SpanString2 b2)
                {
                    return(_ignoreCase ? SpanString2.EqualsIgnoreCase(a2, b2) : SpanString2.Equals(a2, b2));
                }

                throw new ArgumentException($"Second param 'b' is an unknown SpanString type '{b.GetType().Name}', is this a bug?");
            }

            throw new ArgumentException($"First param 'a' is an unknown SpanString type '{a.GetType().Name}', is this a bug?");
        }
 /// <summary>
 /// Compares two strings.
 /// </summary>
 /// <param name="a">The first string to compare.</param>
 /// <param name="b">The second string to compare.</param>
 /// <returns>True if the strings are equal.</returns>
 public bool Equals(SpanString2 a, SpanString2 b)
 {
     return(_ignoreCase ? SpanString2.EqualsIgnoreCase(a, b) : a.Equals(b));
 }