Revert "rename to IERC20Extended"

This reverts commit 1e7d7a5.

CHANGELOG.md

@@ -18,7 +18,7 @@
  * Rename `UpgradeableProxy` to `ERC1967Proxy`. ([#2547](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2547))
  * `ERC777`: Optimize the gas costs of the constructor. ([#2551](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2551))
  * `ERC721URIStorage`: Add a new extension that implements the `_setTokenURI` behavior as it was available in 3.4.0. ([#2555](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2555))
- * `IERC20Extended`: Interface file for the extended ERC20 standard (that includes the optional `name()`, `symbol()` and `decimals()`). ([#2561](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2561))
+ * `IERC20Metadata`: Add a new extended interface that includes the optional `name()`, `symbol()` and `decimals()` functions. ([#2561](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2561))
 
 ### How to upgrade from 3.x
 

contracts/token/ERC20/ERC20.sol

@@ -2,7 +2,8 @@
 
 pragma solidity ^0.8.0;
 
-import "./IERC20Extended.sol";
+import "./IERC20.sol";
+import "./extensions/IERC20Metadata.sol";
 import "../../utils/Context.sol";
 
 /**
@@ -29,7 +30,7 @@ import "../../utils/Context.sol";
  * functions have been added to mitigate the well-known issues around setting
  * allowances. See {IERC20-approve}.
  */
-contract ERC20 is Context, IERC20Extended {
+contract ERC20 is Context, IERC20, IERC20Metadata {
     mapping (address => uint256) private _balances;
 
     mapping (address => mapping (address => uint256)) private _allowances;

contracts/token/ERC20/README.adoc

@@ -10,7 +10,7 @@ TIP: For an overview of ERC20 tokens and a walk through on how to create a token
 There a few core contracts that implement the behavior specified in the EIP:
 
 * {IERC20}: the interface all ERC20 implementations should conform to.
-* {IERC20Extended}: the extended ERC20 interface including the <<ERC20-name,`name`>>, <<ERC20-symbol,`symbol`>> and <<ERC20-decimals,`decimals`>> functions.
+* {IERC20Metadata}: the extended ERC20 interface including the <<ERC20-name,`name`>>, <<ERC20-symbol,`symbol`>> and <<ERC20-decimals,`decimals`>> functions.
 * {ERC20}: the implementation of the ERC20 interface, including the <<ERC20-name,`name`>>, <<ERC20-symbol,`symbol`>> and <<ERC20-decimals,`decimals`>> optional standard extension to the base interface.
 
 Additionally there are multiple custom extensions, including:

contracts/token/ERC20/IERC20Extended.sol → contracts/token/ERC20/extensions/IERC20Metadata.sol

@@ -2,12 +2,12 @@
 
 pragma solidity ^0.8.0;
 
-import "./IERC20.sol";
+import "../IERC20.sol";
 
 /**
- * @dev Interface of the extended ERC20 standard.
+ * @dev Interface for the optional metadata functions from the ERC20 standard.
  */
-interface IERC20Extended is IERC20 {
+interface IERC20Metadata is IERC20 {
     /**
      * @dev Returns the name of the token.
      */