Take the following code snippet:

```
pragma solidity ^0.8.0;

contract MyContract {
    function foo() public returns (uint256 result) {
        // do unsafe work
    }

    function bar() public returns (uint256 result) {
        unchecked {
            uint256 foo_value = foo();
            // do safe work
        }
    }

```

Does the `unchecked` block in the `bar` function disable the safety checks in the `foo` function?