public IAddableTag AddTag(IAddableTag tag)
{
if (tag == null)
{
throw new ArgumentNullException(nameof(tag));
}
StringValueTag that = tag as StringValueTag;
if (that == default(StringValueTag))
{
throw new InvalidRulesException($"Tried to add tags of different types '{RenderForLog()}' and '{tag.RenderForLog()}'.");
}
return(new StringValueTag(Key, Value + that.Value, Duration));
}
