add balanceOfUnderlying

contracts/token/YAM.sol

@@ -142,6 +142,18 @@ contract YAMToken is YAMGovernanceToken {
       return _yamBalances[who].mul(yamsScalingFactor).div(internalDecimals);
     }
 
+    /** @notice Currently unused and not different from balanceOf
+    * @param who The address to query.
+    * @return The balance of the specified address.
+    */
+    function balanceOfUnderlying(address who)
+      external
+      view
+      returns (uint256)
+    {
+      return _yamBalances[who].mul(yamsScalingFactor).div(internalDecimals);
+    }
+
     /**
      * @dev Function to check the amount of tokens that an owner has allowed to a spender.
      * @param owner_ The address which owns the funds.

contracts/token/YAMDelegator.sol

@@ -163,6 +163,21 @@ contract YAMDelegator is YAM, YAMDelegatorInterface {
         owner; // Shh
         delegateToViewAndReturn();
     }
+
+    /**
+     * @notice Currently unused. For future compatability
+     * @param owner The address of the account to query
+     * @return The number of underlying tokens owned by `owner`
+     */
+    function balanceOfUnderlying(address owner)
+        external
+        view
+        returns (uint256)
+    {
+        owner; // Shh
+        delegateToViewAndReturn();
+    }
+
     /*** Gov Functions ***/
 
     /**

contracts/token/YAMTokenInterface.sol

@@ -52,6 +52,7 @@ contract YAMTokenInterface is YAMTokenStorage {
     function transfer(address to, uint256 value) external returns(bool);
     function transferFrom(address from, address to, uint256 value) external returns(bool);
     function balanceOf(address who) external view returns(uint256);
+    function balanceOfUnderlying(address who) external view returns(uint256);
     function allowance(address owner_, address spender) external view returns(uint256);
     function approve(address spender, uint256 value) external returns (bool);
     function increaseAllowance(address spender, uint256 addedValue) external returns (bool);