From 8ab8143a6ec6aa38d8c5b44ce0a1731a4abe4004 Mon Sep 17 00:00:00 2001
From: Patrick McKelvy <pmckelvy1@gmail.com>
Date: Thu, 10 Aug 2023 13:30:56 -0400
Subject: [PATCH 1/4] use comet decimals instead of wrapper decimals.

---
 contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol | 2 +-
 contracts/plugins/assets/compoundv3/vendor/IComet.sol      | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol b/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol
index a4d9e8f62..033cce97d 100644
--- a/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol
+++ b/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol
@@ -53,7 +53,7 @@ contract CTokenV3Collateral is AppreciatingFiatCollateral {
     }
 
     function _underlyingRefPerTok() internal view virtual override returns (uint192) {
-        return shiftl_toFix(ICusdcV3Wrapper(address(erc20)).exchangeRate(), -int8(erc20Decimals));
+        return shiftl_toFix(ICusdcV3Wrapper(address(erc20)).exchangeRate(), -int8(comet.decimals()));
     }
 
     /// Refresh exchange rates and update default status.
diff --git a/contracts/plugins/assets/compoundv3/vendor/IComet.sol b/contracts/plugins/assets/compoundv3/vendor/IComet.sol
index 44fffae2d..e249a3663 100644
--- a/contracts/plugins/assets/compoundv3/vendor/IComet.sol
+++ b/contracts/plugins/assets/compoundv3/vendor/IComet.sol
@@ -6,4 +6,6 @@ interface IComet {
 
     /// @dev uint104
     function targetReserves() external view returns (uint256);
+
+    function decimals() external view returns (uint8);
 }

From ff85cc33b886162067a333e3a699630cc452cdbe Mon Sep 17 00:00:00 2001
From: Patrick McKelvy <pmckelvy1@gmail.com>
Date: Thu, 10 Aug 2023 15:08:03 -0400
Subject: [PATCH 2/4] fix linting.

---
 contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol b/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol
index 033cce97d..fbcee8e90 100644
--- a/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol
+++ b/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol
@@ -53,7 +53,8 @@ contract CTokenV3Collateral is AppreciatingFiatCollateral {
     }
 
     function _underlyingRefPerTok() internal view virtual override returns (uint192) {
-        return shiftl_toFix(ICusdcV3Wrapper(address(erc20)).exchangeRate(), -int8(comet.decimals()));
+        return
+            shiftl_toFix(ICusdcV3Wrapper(address(erc20)).exchangeRate(), -int8(comet.decimals()));
     }
 
     /// Refresh exchange rates and update default status.

From 8ddeef2c8c3e6d907db60f5b857937cd84561f7f Mon Sep 17 00:00:00 2001
From: Patrick McKelvy <pmckelvy1@gmail.com>
Date: Mon, 21 Aug 2023 11:05:06 -0400
Subject: [PATCH 3/4] cache comet decimals.

---
 contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol b/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol
index fbcee8e90..369f93532 100644
--- a/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol
+++ b/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol
@@ -31,6 +31,7 @@ contract CTokenV3Collateral is AppreciatingFiatCollateral {
     IERC20 public immutable rewardERC20;
     IComet public immutable comet;
     uint256 public immutable reservesThresholdIffy; // {qUSDC}
+    uint8 public immutable cometDecimals;
 
     /// @param config.chainlinkFeed Feed units: {UoA/ref}
     constructor(
@@ -41,6 +42,7 @@ contract CTokenV3Collateral is AppreciatingFiatCollateral {
         rewardERC20 = ICusdcV3Wrapper(address(config.erc20)).rewardERC20();
         comet = IComet(address(ICusdcV3Wrapper(address(erc20)).underlyingComet()));
         reservesThresholdIffy = reservesThresholdIffy_;
+        cometDecimals = comet.decimals();
     }
 
     function bal(address account) external view override(Asset, IAsset) returns (uint192) {
@@ -54,7 +56,7 @@ contract CTokenV3Collateral is AppreciatingFiatCollateral {
 
     function _underlyingRefPerTok() internal view virtual override returns (uint192) {
         return
-            shiftl_toFix(ICusdcV3Wrapper(address(erc20)).exchangeRate(), -int8(comet.decimals()));
+            shiftl_toFix(ICusdcV3Wrapper(address(erc20)).exchangeRate(), -int8(cometDecimals));
     }
 
     /// Refresh exchange rates and update default status.

From ff132ca6e2fad741a26035204ddd00af3425b024 Mon Sep 17 00:00:00 2001
From: Patrick McKelvy <pmckelvy1@gmail.com>
Date: Tue, 22 Aug 2023 13:12:52 -0400
Subject: [PATCH 4/4] fix linting.

---
 contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol b/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol
index 369f93532..f0f170360 100644
--- a/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol
+++ b/contracts/plugins/assets/compoundv3/CTokenV3Collateral.sol
@@ -55,8 +55,7 @@ contract CTokenV3Collateral is AppreciatingFiatCollateral {
     }
 
     function _underlyingRefPerTok() internal view virtual override returns (uint192) {
-        return
-            shiftl_toFix(ICusdcV3Wrapper(address(erc20)).exchangeRate(), -int8(cometDecimals));
+        return shiftl_toFix(ICusdcV3Wrapper(address(erc20)).exchangeRate(), -int8(cometDecimals));
     }
 
     /// Refresh exchange rates and update default status.