Update EIP-6909: index id, not caller

Merged by EIP-Bot.

EIPS/eip-6909.md

@@ -260,7 +260,7 @@ SHOULD be logged with the `receiver` address as the zero address when an `amount
 
   inputs:
     - name: caller
-      indexed: true
+      indexed: false
       type: address
     - name: sender
       indexed: true
@@ -269,7 +269,7 @@ SHOULD be logged with the `receiver` address as the zero address when an `amount
       indexed: true
       type: address
     - name: id
-      indexed: false
+      indexed: true
       type: uint256
     - name: amount
       indexed: false
@@ -482,7 +482,7 @@ contract ERC6909 {
     /// @param receiver The address of the receiver.
     /// @param id The id of the token.
     /// @param amount The amount of the token.
-    event Transfer(address indexed caller, address indexed sender, address indexed receiver, uint256 id, uint256 amount);
+    event Transfer(address caller, address indexed sender, address indexed receiver, uint256 indexed id, uint256 amount);
 
     /// @notice The event emitted when an operator is set.
     /// @param owner The address of the owner.
@@ -517,7 +517,7 @@ contract ERC6909 {
         if (balanceOf[msg.sender][id] < amount) revert InsufficientBalance(msg.sender, id);
         balanceOf[msg.sender][id] -= amount;
         balanceOf[receiver][id] += amount;
-        emit Transfer(msg.sender, receiver, id, amount);
+        emit Transfer(msg.sender, msg.sender, receiver, id, amount);
         return true;
     }
 
@@ -537,7 +537,7 @@ contract ERC6909 {
         if (balanceOf[sender][id] < amount) revert InsufficientBalance(sender, id);
         balanceOf[sender][id] -= amount;
         balanceOf[receiver][id] += amount;
-        emit Transfer(sender, receiver, id, amount);
+        emit Transfer(msg.sender, sender, receiver, id, amount);
         return true;
     }
 
@@ -572,14 +572,14 @@ contract ERC6909 {
       // WARNING: important safety checks should precede calls to this method.
       balanceOf[receiver][id] += amount;
       totalSupply[id] += amount;
-      emit Transfer(address(0), receiver, id, amount);
+      emit Transfer(msg.sender, address(0), receiver, id, amount);
     }
 
     function _burn(address sender, uint256 id, uint256 amount) internal {
       // WARNING: important safety checks should precede calls to this method.
       balanceOf[sender][id] -= amount;
       totalSupply[id] -= amount;
-      emit Transfer(sender, address(0), id, amount);
+      emit Transfer(msg.sender, sender, address(0), id, amount);
     }
 }
 ```