make justification_bitfield bytes

Author: ChihChengLiang

eth/beacon/types/states.py

@@ -11,6 +11,7 @@
 
 import rlp
 from rlp.sedes import (
+    binary,
     CountableList,
 )
 
@@ -66,7 +67,8 @@ class BeaconState(rlp.Serializable):
         # Finality
         ('previous_justified_slot', uint64),
         ('justified_slot', uint64),
-        ('justification_bitfield', uint64),
+        # TODO: check if justification_bitfield is bytes or int
+        ('justification_bitfield', binary),
         ('finalized_slot', uint64),
 
         # Recent state

tests/beacon/conftest.py

@@ -158,7 +158,7 @@ def sample_beacon_state_params(sample_fork_data_params):
         'persistent_committee_reassignments': (),
         'previous_justified_slot': 0,
         'justified_slot': 0,
-        'justification_bitfield': 0,
+        'justification_bitfield': b'\x00',
         'finalized_slot': 0,
         'latest_crosslinks': (),
         'latest_block_roots': (),