fix(spec-specs,tests): keep the blob schedule unchanged at Bogota

packages/testing/src/execution_testing/forks/forks/eips/bogota/eip_8198.py

@@ -2,25 +2,16 @@
 EIP-8198: Quick Slots.
 
 Reduce the consensus-layer slot duration. The execution layer lowers the
-maximum per-block base fee change and updates the blob schedule so that fee
-dynamics and blob throughput per unit of wall-clock time stay close to their
-previous values.
+maximum per-block base fee change so that fee dynamics per unit of wall-clock
+time stay close to their previous values.
 
 https://eips.ethereum.org/EIPS/eip-8198
 """
 
 from ....base_fork import BaseFork
 
 
-class EIP8198(
-    BaseFork,
-    # Provisional values, pending a joint decision with the consensus layer.
-    update_blob_constants={
-        "TARGET_BLOBS_PER_BLOCK": 12,
-        "MAX_BLOBS_PER_BLOCK": 18,
-        "BLOB_BASE_FEE_UPDATE_FRACTION": 12018519,
-    },
-):
+class EIP8198(BaseFork):
     """EIP-8198 class."""
 
     @classmethod

src/ethereum/forks/bogota/vm/gas.py

@@ -128,19 +128,13 @@ class GasCosts:
     )
 
     # Blobs
-    #
-    # The target, maximum, and update fraction are provisional pending a
-    # joint decision with the consensus layer. They keep both the fastest
-    # rise and the fastest fall of the blob base fee, per unit of
-    # wall-clock time, and the ratio of maximum to target unchanged under
-    # more frequent blocks.
     PER_BLOB: Final[U64] = U64(2**17)
-    BLOB_SCHEDULE_TARGET: Final[U64] = U64(12)
+    BLOB_SCHEDULE_TARGET: Final[U64] = U64(14)
     BLOB_TARGET_GAS_PER_BLOCK: Final[U64] = PER_BLOB * BLOB_SCHEDULE_TARGET
     BLOB_BASE_COST: Final[Uint] = Uint(2**13)
-    BLOB_SCHEDULE_MAX: Final[U64] = U64(18)
+    BLOB_SCHEDULE_MAX: Final[U64] = U64(21)
     BLOB_MIN_GASPRICE: Final[Uint] = Uint(1)
-    BLOB_BASE_FEE_UPDATE_FRACTION: Final[Uint] = Uint(12018519)
+    BLOB_BASE_FEE_UPDATE_FRACTION: Final[Uint] = Uint(11684671)
 
     # Block Access Lists
     BLOCK_ACCESS_LIST_ITEM: Final[ExecutionGas] = ExecutionGas(Uint(2000))

tests/bogota/eip8198_quick_slots/eip_checklist_external_coverage.txt

@@ -1,5 +1,4 @@
-general/code_coverage/eels = EIP-8198 changes the base fee update in forks/bogota/fork.py (calculate_base_fee_per_gas, BASE_FEE_MAX_CHANGE_NUMERATOR, BASE_FEE_MAX_CHANGE_DENOMINATOR) and the blob schedule constants in forks/bogota/vm/gas.py; both directions of every changed branch are driven by this suite, and mutating any of the five changed constants back to its Amsterdam value makes tests in this suite fail
+general/code_coverage/eels = EIP-8198 changes the base fee update in forks/bogota/fork.py (calculate_base_fee_per_gas, BASE_FEE_MAX_CHANGE_NUMERATOR, BASE_FEE_MAX_CHANGE_DENOMINATOR); both directions of every changed branch are driven by this suite, and mutating either changed constant back to its Amsterdam value makes tests in this suite fail
 general/code_coverage/test_coverage = Fill the suite with `uv run fill --cov=ethereum.forks.bogota --cov-branch --cov-report=term-missing --until Bogota tests/bogota/eip8198_quick_slots`
 general/code_coverage/missed_lines = In calculate_base_fee_per_gas, only the `raise InvalidBlock` for an out-of-bounds gas limit is missed at fill time; it runs only in block validation and is covered by the one_beyond cases of test_gas_limit_adjustment_unchanged when their fixtures are validated with `just validate-blocks <fixtures>/blockchain_tests`
-blob_count_changes/test/eip4844_blobs_changes = tests/cancun/eip4844_blobs and tests/osaka/eip7918_blob_reserve_price read the blob schedule from the fork, so at Bogota they run against the new target, maximum, and update fraction; at the Amsterdam to Bogota transition, test_fork_transition_excess_blob_gas_post_blob_genesis and test_reserve_price_at_transition cover the excess carry-over and the reserve price under the new schedule; re-verify with `uv run fill --collect-only tests/cancun/eip4844_blobs tests/osaka/eip7918_blob_reserve_price --from Bogota --until Bogota`
 general/code_coverage/second_client = Optional

tests/bogota/eip8198_quick_slots/eip_checklist_not_applicable.txt

@@ -7,8 +7,9 @@ block_header_field = EIP does not add any new block header fields
 block_body_field = EIP does not add any new block body fields
 gas_refunds_changes = EIP does not change any refund rules
 execution_layer_request = EIP does not introduce an execution layer request
-new_transaction_validity_constraint = EIP adds no transaction validity constraint; the blob fee check is unchanged apart from the blob base fee it compares against, which test_insufficient_max_fee_per_blob_gas covers
+new_transaction_validity_constraint = EIP adds no transaction validity constraint
 modified_transaction_validity_constraint = EIP changes no transaction validity constraint
 gas_cost_changes/test/gas_updates_measurement = EIP changes no opcode or intrinsic gas cost; the base fee update it changes is measured by test_base_fee_update
 gas_cost_changes/test/out_of_gas = EIP changes no gas cost a transaction can run out of
-block_level_constraint/test/content = The blob limit counts blobs only, so no transaction type, log, receipt, or withdrawal content affects it
+block_level_constraint = EIP adds or changes no block-level constraint; test_blob_count_limit_unchanged_at_fork pins the parent fork's blob limit at the fork block
+blob_count_changes = EIP does not change the blob schedule; test_blob_schedule_unchanged_across_fork pins the parent fork's schedule across the fork

tests/bogota/eip8198_quick_slots/spec.py

@@ -23,8 +23,8 @@ class Spec(EIP4844Spec):
     """
     Parameters from the EIP-8198 specifications. Extends the EIP-4844 spec.
 
-    The new base fee change and blob schedule are read from the fork, which
-    carries them from the EIP-8198 fork class.
+    The new base fee change is read from the fork, which carries it from the
+    EIP-8198 fork class.
     """
 
     GAS_LIMIT_ADJUSTMENT_FACTOR = 1024