This function is implemented solely for the purpose of translating garbage pointers into knowingly invalid ones. Any pointer that contains a SlotNo, TxIx or CertIx that is too large to fit into Word32, Word16 and Word16 respectively, will have all of its values set to 0 using normalizePtr.

There are two reasons why we can safely do that at the Babbage/Conway era boundary:

• Invalid pointers are no longer allowed in transactions starting with Babbage era
• There are only a handful of Ptrs on mainnet that are invalid.

Once the transition is complete and we are officially in Conway era, this translation logic can be removed in favor of a fixed deserializer that does the same thing for all eras prior to Babbage.