### 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

Format: <algorithm>:<checksum|url>, e.g. checksum="sha256:D98291AC[...]B6DC7B97",
        checksum="sha256:http://example.com/path/sha256sum.txt"'
      - If you worry about portability, only the sha1 algorithm is available
        on all platforms and python versions.
      - The third party hashlib library can be installed for access to additional algorithms.
      - Additionally, if a checksum is passed to this parameter, and the file exist under
        the C(dest) location, the I(destination_checksum) would be calculated, and if
        checksum equals I(destination_checksum), the file download would be skipped
        (unless C(force) is true). If the checksum does not equal I(destination_checksum),
        the destination file is deleted.
    type: str
    default: ''
    version_added: "2.0"
  use_proxy:
    description:
      - if C(no), it will not use a proxy, even if one is defined in
        an environment variable on the target hosts.
    type: bool
    default: yes
  validate_certs:
    description:
      - If C(no), SSL certificates will not be validated.
      - This should only be used on personally controlled sites using self-signed certificates.
    type: bool
    default: yes
  timeout:
    description:
      - Timeout in seconds for URL request.
    type: int
    default: 10