/// <inheritdoc/>
        public bool Equals(PNCounterDictionary <TKey> other)
        {
            if (ReferenceEquals(other, null))
            {
                return(false);
            }
            if (ReferenceEquals(this, other))
            {
                return(true);
            }

            return(Equals(_underlying, other._underlying));
        }
 public PNCounterDictionary <TKey> Merge(PNCounterDictionary <TKey> other) =>
 new PNCounterDictionary <TKey>(_underlying.Merge(other._underlying));