Address Danny's comment

scripts/phase0/build_spec.py

@@ -18,9 +18,6 @@ from eth2spec.utils.bls_stub import *
 # stub, will get overwritten by real var
 SLOTS_PER_EPOCH = 64
 
-def int_to_bytes(integer: int, length: int) -> bytes:
-    return integer.to_bytes(length, 'little')
-
 Slot = NewType('Slot', int)  # uint64
 Epoch = NewType('Epoch', int)  # uint64
 Shard = NewType('Shard', int)  # uint64

specs/core/0_beacon-chain.md

@@ -194,7 +194,7 @@ These configurations are updated for releases, but may be out of sync during `de
 | `GENESIS_SLOT` | `0` |
 | `GENESIS_EPOCH` | `0` |
 | `FAR_FUTURE_EPOCH` | `2**64 - 1` |
-| `ZERO_HASH` | `int_to_bytes(0, length=32)` |
+| `ZERO_HASH` | `b'\x00' * 32` |
 | `BLS_WITHDRAWAL_PREFIX` | `0` |
 
 ### Time parameters