### SUMMARY
```
  sha256sum:
    description:
      - If a SHA-256 checksum is passed to this parameter, the digest of the
        destination file will be calculated after it is downloaded to ensure
        its integrity and verify that the transfer completed successfully.
        This option is deprecated. Use C(checksum) instead.
```

There is no `module.deprecate` either for `sha256sum`.

the argument has been declared deprecated in commit b3b11fbce26 (2017)

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
get_url

* ansible version: 2.10

backup = module.params['backup']
    force = module.params['force']
    sha256sum = module.params['sha256sum']
    checksum = module.params['checksum']
    use_proxy = module.params['use_proxy']
    timeout = module.params['timeout']
    tmp_dest = module.params['tmp_dest']
    result = dict(
        changed=False,
        checksum_dest=None,
        checksum_src=None,
        dest=dest,
        elapsed=0,
        url=url,
    )
    
    if isinstance(module.params['headers'], dict):
        headers = module.params['headers']
    elif module.params['headers']:
        try:
            headers = dict(item.split(':', 1) for item in module.params['headers'].split(','))
            module.deprecate('Supplying `headers` as a string is deprecated. Please use dict/hash format for `headers`', version='2.10')
        except Exception:
            module.fail_json(msg="The string representation for the `headers` parameter requires a key:value,key:value syntax to be properly parsed.", **result)
    else:
        headers = None
    dest_is_dir = os.path.isdir(dest)
    last_mod_time = None
    
    if sha256sum: