/// <summary>
/// Experimental feature
/// Checks whether specified record is present in memory
/// (between HeadAddress and tail, or between fromAddress
/// and tail)
/// </summary>
/// <param name="key">Key of the record.</param>
/// <param name="fromAddress">Look until this address</param>
/// <returns>Status</returns>
internal Status ContainsKeyInMemory(ref Key key, long fromAddress = -1)
{
return(fht.InternalContainsKeyInMemory(ref key, ctx, fromAddress));
}