example-epoch-typing.patch

diff --git a/src/phase0/beacon_state.rs b/src/phase0/beacon_state.rs
index 5997634..d283932 100644
--- a/src/phase0/beacon_state.rs
+++ b/src/phase0/beacon_state.rs
@@ -3,14 +3,14 @@ use crate::phase0::fork::Fork;
 use crate::phase0::operations::{Checkpoint, Eth1Data, PendingAttestation};
 use crate::phase0::validator::Validator;
 use crate::phase0::JUSTIFICATION_BITS_LENGTH;
-use crate::primitives::{Bytes32, Gwei, Root, Slot};
+use crate::primitives::{Bytes32, Epoch, Gwei, Root, Slot};
 use ssz_rs::prelude::*;
 
 pub(super) const fn get_eth1_data_votes_bound(
-    epochs_per_eth1_voting_period: usize,
+    epochs_per_eth1_voting_period: Epoch,
     slots_per_epoch: usize,
 ) -> usize {
-    epochs_per_eth1_voting_period * slots_per_epoch
+    epochs_per_eth1_voting_period as usize * slots_per_epoch
 }
 
 pub(super) const fn get_pending_attestations_bound(
diff --git a/src/phase0/presets/mainnet.rs b/src/phase0/presets/mainnet.rs
index ae7e885..65be1b4 100644
--- a/src/phase0/presets/mainnet.rs
+++ b/src/phase0/presets/mainnet.rs
@@ -44,7 +44,7 @@ pub const SLOTS_PER_EPOCH: Slot = 32;
 pub const MIN_SEED_LOOKAHEAD: Epoch = 1;
 pub const MAX_SEED_LOOKAHEAD: Epoch = 4;
 pub const MIN_EPOCHS_TO_INACTIVITY_PENALTY: Epoch = 4;
-pub const EPOCHS_PER_ETH1_VOTING_PERIOD: usize = 64;
+pub const EPOCHS_PER_ETH1_VOTING_PERIOD: Epoch = 64;
 pub const SLOTS_PER_HISTORICAL_ROOT: usize = 8192;
 pub const EPOCHS_PER_HISTORICAL_VECTOR: usize = 65536;
 pub const EPOCHS_PER_SLASHINGS_VECTOR: usize = 8192;
diff --git a/src/phase0/presets/mod.rs b/src/phase0/presets/mod.rs
index 25e5243..85be9d1 100644
--- a/src/phase0/presets/mod.rs
+++ b/src/phase0/presets/mod.rs
@@ -19,7 +19,7 @@ pub struct Preset {
     pub min_seed_lookahead: Epoch,
     pub max_seed_lookahead: Epoch,
     pub min_epochs_to_inactivity_penalty: Epoch,
-    pub epochs_per_eth1_voting_period: usize,
+    pub epochs_per_eth1_voting_period: Epoch,
     pub slots_per_historical_root: usize,
     pub epochs_per_historical_vector: usize,
     pub epochs_per_slashings_vector: usize,
diff --git a/src/phase0/state_transition/context.rs b/src/phase0/state_transition/context.rs
index a8320aa..13e6f2d 100644
--- a/src/phase0/state_transition/context.rs
+++ b/src/phase0/state_transition/context.rs
@@ -19,7 +19,7 @@ pub struct Context {
     pub min_seed_lookahead: Epoch,
     pub max_seed_lookahead: Epoch,
     pub min_epochs_to_inactivity_penalty: Epoch,
-    pub epochs_per_eth1_voting_period: usize,
+    pub epochs_per_eth1_voting_period: Epoch,
     pub slots_per_historical_root: usize,
     pub epochs_per_historical_vector: usize,
     pub epochs_per_slashings_vector: usize,