/// <inheritdoc/>
public override int GetHashCode()
{
const int nullValue = -1;
return(TimeStamp.GetHashCode()
^ StringCleaner.PrepareForComparison(DisplayName).GetHashCode()
^ HashStringCollection(EmailAddresses)
^ HashMergeable(Person)
^ HashPhoneNumbers(PhoneNumbers)
^ HashMergeable(Work)
^ HashStringCollection(InstantMessengerHandles)
^ StringCleaner.PrepareForComparison(WebPagePersonal).GetHashCode()
^ HashMergeable(AddressHome)
^ StringCleaner.PrepareForComparison(WebPageWork).GetHashCode());