We are just back, checked out 2 March after arriving 21 February. In our case, starting 27 February, successive holds were placed on my credit card to keep the total at no more than the balance owing plus $100. (My bank lists these as "pending transactions" but states that in some cases, pending transactions are pre-authorizations that are later adjusted to match the actual charge; they give gas stations as the most common example.)
Specifically, on 27 March we had a small balance owing against room charges from the previous couple of days. A hold for this amount plus $100 was placed on the 27th. On the 28th, we charged a number of meals to our room using our magic bands and made a few small purchases. When the total of these new charges exceeded $100, a new hold for the additional charges was placed. In the evening of the 28th, we charged some additional souvenirs using our magic bands. A second hold on the 28th was added for the additional amounts after the transaction that brought the total of the new charges over $100. A third new hold appeared on the 28th after an additional purchase that exceeded $100.
So, by the end of the day on the 28th, we had four separate holds on our card, with the total of all four holds equal to the amount owing on our room charges plus $100. A new hold was placed each time a series of small charges accumulated to exceed $100 or after any single charge greater than $100.
We used cash to pay off most of the balance owing in room charges on 28 February, but added some new charges on 1 March and made an additional cash payment that evening. My bank currently shows a "pending credit" dated 1 March that offsets the 4 holds from 27 & 28 February and a pending charge for the correct net charges against the room, considering accumulated charges less the cash payments. This appears to be the pre-checkout charge to my card to clear the balance owing. We made some additional charges to the room for breakfast the morning of checkout; these currently appear as a pending charge dated 2 March.
In summary, the transactions appear reasonable. I will see what happens in the next couple of days as debits and credits either change from pending to posted or disappear. I am not sure at this point which will happen. The only potential complication in our case is that these are foreign currency transactions on my credit card, so debits and offsetting credits in USD could still cost me something, while a hold that is removed will not.
My apologies for the very lengthy posting. I will provide an update once all the credit card transactions are finalized (in "three to five business days", according to my bank).