Merge pull request #179 from okp4/fix/mint-inflation

fix(mint): provide annual inflation rate

pkg/mint/okp4InflationCalculationFn.go

@@ -6,7 +6,7 @@ import (
 )
 
 var (
-	initialInflation = sdk.NewDecWithPrec(15, 2)
+	initialInflation = sdk.NewDecWithPrec(75, 3)
 )
 
 // Okp4InflationCalculationFn is the function used to calculate the inflation for the OKP4 network.
@@ -18,7 +18,6 @@ var (
 // See: https://docs.okp4.network/docs/whitepaper/tokenomics#staking-rewards
 func Okp4InflationCalculationFn(ctx sdk.Context, minter minttypes.Minter, params minttypes.Params, _ sdk.Dec) sdk.Dec {
 	year := uint64(ctx.BlockHeight()) / params.BlocksPerYear
-	inflationForYear := initialInflation.Mul(params.InflationRateChange.Power(year))
 
-	return inflationForYear.QuoInt64Mut(int64(params.BlocksPerYear))
+	return initialInflation.Mul(params.InflationRateChange.Power(year))
 }

pkg/mint/okp4InflationCalculationFn_test.go

@@ -28,39 +28,39 @@ func TestOkp4InflationCalculationFn(t *testing.T) {
 					blockHeight:         0,
 					blocksPerYear:       10,
 					inflationRateChange: .8,
-				}, want: sdk.NewDecWithPrec(15, 3),
+				}, want: sdk.NewDecWithPrec(75, 3),
 			},
 			{
 				name: "Inflation for the last block of the first year",
 				args: args{
 					blockHeight:         9,
 					blocksPerYear:       10,
 					inflationRateChange: .8,
-				}, want: sdk.NewDecWithPrec(15, 3),
+				}, want: sdk.NewDecWithPrec(75, 3),
 			},
 			{
 				name: "Inflation for the first block of the second year",
 				args: args{
 					blockHeight:         10,
 					blocksPerYear:       10,
 					inflationRateChange: .8,
-				}, want: sdk.NewDecWithPrec(12, 3),
+				}, want: sdk.NewDecWithPrec(6, 2),
 			},
 			{
 				name: "Inflation for the second block of the third year",
 				args: args{
 					blockHeight:         21,
 					blocksPerYear:       10,
 					inflationRateChange: .8,
-				}, want: sdk.MustNewDecFromStr("0.0096"),
+				}, want: sdk.MustNewDecFromStr("0.048"),
 			},
 			{
 				name: "Inflation for a block in the 16th year",
 				args: args{
 					blockHeight:         87899401,
 					blocksPerYear:       5256000,
 					inflationRateChange: .8,
-				}, want: sdk.MustNewDecFromStr("0.000000000803296166"),
+				}, want: sdk.MustNewDecFromStr("0.002111062325329920"),
 			},
 		}