Use LTE instead of Equal (cosmos#4503)

x/distribution/keeper/delegation.go

@@ -98,14 +98,16 @@ func (k Keeper) calculateDelegationRewards(ctx sdk.Context, val exported.Validat
 	// when multiplied by slash fractions (see above). We could only use equals if
 	// we had arbitrary-precision rationals.
 	currentStake := val.TokensFromShares(del.GetShares())
-	if stake.GT(currentStake) {
 
+	if stake.GT(currentStake) {
 		// Account for rounding inconsistencies between:
+		//
 		//     currentStake: calculated as in staking with a single computation
 		//     stake:        calculated as an accumulation of stake
 		//                   calculations across validator's distribution periods
+		//
 		// These inconsistencies are due to differing order of operations which
-		// will inevitably have  different accumulated rounding and may lead to
+		// will inevitably have different accumulated rounding and may lead to
 		// the smallest decimal place being one greater in stake than
 		// currentStake. When we calculated slashing by period, even if we
 		// round down for each slash fraction, it's possible due to how much is
@@ -118,7 +120,8 @@ func (k Keeper) calculateDelegationRewards(ctx sdk.Context, val exported.Validat
 		// A small amount of this error is tolerated and corrected for,
 		// however any greater amount should be considered a breach in expected
 		// behaviour.
-		if stake.Equal(currentStake.Add(sdk.SmallestDec().MulInt64(3))) {
+		marginOfErr := sdk.SmallestDec().MulInt64(3)
+		if stake.LTE(currentStake.Add(marginOfErr)) {
 			stake = currentStake
 		} else {
 			panic(fmt.Sprintf("calculated final stake for delegator %s greater than current stake"+