Existing Hedera semantics for SELFDESTRUCT will be preserved

Update to specify that existing Hedera semantics for SELFDESTRUCT will be
preserved in some cases where they involve the Hedera security model. And
this leads to known EVM non-equivalence.  (Which already exists.)

Signed-off-by: David S Bakin <117694041+david-bakin-sl@users.noreply.github.com>

HIP/hip-868.md

@@ -95,10 +95,14 @@ contract will not be marked for removal.
 
 ### Hedera Services
 
-Hedera services may need to be changed to ensure that the transaction processing
-does not leave a "shadow" account number for transient self-destructs. Such
-transient self-destructs will also need to be tested to ensure all HTS tokens
-are properly swept during the sweep as well as the transient contract modes.
+This HIP addresses only EVM changes with respect to self-destruct, and thus,
+only involves changes to the case where a SELFDESTRUCT is done as a sweep
+(the contract being destructed existed prior to the transaction in which it is
+destructed).  When it is a transient self-destruct no changes to existing
+Hedera behavior will be made.
+
+* For a transient self-destruct the record file will record the EVM address
+  of the contract and not any Hedera contract id.
 
 ## Backwards Compatibility
 
@@ -142,7 +146,15 @@ out-of-date features within Hedera.
 
 ## Open Issues
 
-// NONE
+There will be EVM non-equivalences where self-destructed contracts hold HTS tokens
+and/or use Hedera system contracts, especially in the transient case (where the HTS
+tokens are transferred to the contract in the same transaction as it has been
+self-destructed), where the Hedera security model interacts with the sweeping of
+tokens and balances.  For example, if, the beneficiary account doesn't have an
+allowance for a token held by the contract.  In this case (and similar situations)
+the SELFDESTRUCT will fail, where in the EVM it never fails.  These non-equivalences
+already exist and will not be resolved by this HIP (but can be reconsidered in
+the future.)
 
 ## References
 
@@ -152,4 +164,4 @@ out-of-date features within Hedera.
 ## Copyright/license
 
 This document is licensed under the Apache License, Version 2.0 --
-see [LICENSE](../LICENSE) or (https://www.apache.org/licenses/LICENSE-2.0)
+see [LICENSE](../LICENSE) or (https://www.apache.org/licenses/LICENSE-2.0)