refactor(gamma): big decimal

Author: cong-or

src/chain-libs/chain-impl-mockchain/src/vote/tally.rs

@@ -176,6 +176,7 @@ impl TallyResult {
             const GAMMA: &str = "QUADRATIC_VOTING_GAMMA";
             const PRECISION: &str = "QUADRATIC_VOTING_PRECISION";
 
+            // Apply quadratic scaling if gamma value specified in env var. Else gamma is 1 and has no effect.
             let gamma = env::var(GAMMA).unwrap_or(1.to_string());
             let precision =
                 i64::from_str(&env::var(PRECISION).unwrap_or(1.to_string())).unwrap_or(1);

src/chain-libs/chain-vote/src/tally.rs

@@ -168,6 +168,7 @@ impl EncryptedTally {
         const GAMMA: &str = "QUADRATIC_VOTING_GAMMA";
         const PRECISION: &str = "QUADRATIC_VOTING_PRECISION";
 
+        // Apply quadratic scaling if gamma value specified in env var. Else gamma is 1 and has no effect.
         let gamma = env::var(GAMMA).unwrap_or(1.to_string());
         let precision = i64::from_str(&env::var(PRECISION).unwrap_or(1.to_string())).unwrap_or(1);