From 6cbef7b58bc84c43c1dcbf29d5e9eef63fd7c7ad Mon Sep 17 00:00:00 2001
From: Luke Anderson <luke@lukeanderson.com.au>
Date: Thu, 5 Sep 2019 20:06:46 +1000
Subject: [PATCH] Undoing changes to ChainSpec. The discrepancies from the
 Eth2.0 spec are necessary in our case.

---
 docs/api_spec.yaml           | 4 ----
 eth2/types/src/chain_spec.rs | 6 +-----
 2 files changed, 1 insertion(+), 9 deletions(-)

diff --git a/docs/api_spec.yaml b/docs/api_spec.yaml
index ced07e96d..23608807e 100644
--- a/docs/api_spec.yaml
+++ b/docs/api_spec.yaml
@@ -1896,10 +1896,6 @@ components:
       type: object
       description: "Stores all of the values which specify a particular chain. The `ChainSpec` object in Lighthouse"
       properties:
-        far_future_epoch:
-          type: integer
-          format: uint64
-          example: 18446744073709551615
         base_rewards_per_epoch:
           type: integer
           format: uint64
diff --git a/eth2/types/src/chain_spec.rs b/eth2/types/src/chain_spec.rs
index 17e9dba49..d59e0db0a 100644
--- a/eth2/types/src/chain_spec.rs
+++ b/eth2/types/src/chain_spec.rs
@@ -24,13 +24,11 @@ pub struct ChainSpec {
     /*
      * Constants
      */
+    #[serde(skip_serializing)] // skipped because Serde TOML has trouble with u64::max
     pub far_future_epoch: Epoch,
-    // The above may need to be skipped because Serde TOML has trouble with u64::max.
-    // Use: #[serde(skip_serializing)]
     pub base_rewards_per_epoch: u64,
     pub deposit_contract_tree_depth: u64,
     pub seconds_per_day: u64,
-    //TODO missing JUSTIFICATION_BITS_LENGTH and ENDIANNESS
 
     /*
      * Misc
@@ -54,7 +52,6 @@ pub struct ChainSpec {
      * Initial Values
      */
     pub genesis_slot: Slot,
-    //TODO Missing genesis_epoch
     #[serde(deserialize_with = "u8_from_hex_str", serialize_with = "u8_to_hex_str")]
     pub bls_withdrawal_prefix_byte: u8,
 
@@ -62,7 +59,6 @@ pub struct ChainSpec {
      * Time parameters
      */
     pub milliseconds_per_slot: u64,
-    //TODO should we also have SECONDS_PER_SLOT?
     pub min_attestation_inclusion_delay: u64,
     pub min_seed_lookahead: Epoch,
     pub activation_exit_delay: u64,