fix comments

src/agent0/hyperfuzz/system_fuzz/invariant_checks.py

@@ -280,6 +280,13 @@ def _check_price_spike(interface: HyperdriveReadInterface, pool_state: PoolState
 
 
 def _check_negative_interest(interface: HyperdriveReadInterface, pool_state: PoolState) -> InvariantCheckResults:
+    """Check for negative interest in the pool.
+
+    If the rate went down, post a log
+    If the pool is paused, log is warning regardless of relative rate change
+    If the pool is not paused and the rate went down by more than the relative tol, log is critical
+    If the pool is not paused, but the rate did not go down by more than the relative tol, log is warning
+    """
     # Hyperdrive base & eth balances should always be zero
     failed = False
     exception_message: str | None = None
@@ -304,19 +311,15 @@ def _check_negative_interest(interface: HyperdriveReadInterface, pool_state: Poo
     previous_pool_state = interface.get_hyperdrive_state(block_identifier=previous_block_number)
     previous_vault_share_price = previous_pool_state.pool_info.vault_share_price
 
-    # If the rate went down, post a log
-    # If the pool is paused, log is warning regardless of relative rate change
-    # If the pool is not paused and the rate went down by more than the relative tol, log is critical
-    # if the pool is not paused, but the rate did not go down by more than the relative tol, log is warning
-    if current_vault_share_price - previous_vault_share_price <= -NEGATIVE_INTEREST_ATOL:  # rate went down
+    # Absolute check to see if the rate went down
+    if current_vault_share_price - previous_vault_share_price <= -NEGATIVE_INTEREST_ATOL:
         log_level = logging.WARNING
         if interface.get_pool_is_paused():
             paused_str = "paused"
         else:
             paused_str = "unpaused"
-            if (
-                previous_vault_share_price * NEGATIVE_INTEREST_RTOL <= current_vault_share_price
-            ):  # rate went down by a lot
+            # relative check to see if the rate went down by a lot
+            if previous_vault_share_price * NEGATIVE_INTEREST_RTOL <= current_vault_share_price:
                 log_level = logging.CRITICAL
         failed = True
         exception_data["invariance_check:current_vault_share_price"] = current_vault_share_price