*   operations to distinguish between zero and absent. If we do this, then perhaps we should add
   *   replace(key, long).
   *
   * - Introduce a special-value private static final AtomicLong that would have the meaning of
   *   removal-in-progress, and rework all operations to properly distinguish between zero and
   *   absent.
   */

  /**

During local development, there is a script that builds the site and checks for any changes, live-reloading:

<div class="termy">

```console
$ python ./scripts/docs.py live

<span style="color: green;">[INFO]</span> Serving on http://127.0.0.1:8008
<span style="color: green;">[INFO]</span> Start watching changes
<span style="color: green;">[INFO]</span> Start detecting changes
```

</div>

#### Union { #union }

You can declare that a variable can be any of **several types**, for example, an `int` or a `str`.

To define it you use the <dfn title='also called "bitwise or operator", but that meaning is not relevant here'>vertical bar (`|`)</dfn> to separate both types.

This is called a "union", because the variable can be anything in the union of those two sets of types.

```Python hl_lines="1"

        "//learning/brain/mlir/...",
        "//learning/brain/tfrt/...",
        "//learning/lib/ami/simple_ml/...",
        "//learning/pathways/...",
        "//learning/serving/contrib/tfrt/mlir/canonical_ops/...",
        "//learning/serving/experimental/remote_predict/...",
        "//perftools/accelerators/xprof/convert/...",
        "//perftools/accelerators/xprof/integration_tests/...",
        "//smartass/brain/...",

  protected Equivalence() {}

  /**
   * Returns {@code true} if the given objects are considered equivalent.
   *
   * <p>This method describes an <i>equivalence relation</i> on object references, meaning that for
   * all references {@code x}, {@code y}, and {@code z} (any of which may be null):
   *
   * <ul>
   *   <li>{@code equivalent(x, x)} is true (<i>reflexive</i> property)

	CompressedSize64 uint64

	// UncompressedSize64 is the uncompressed size of the file in bytes.
	UncompressedSize64 uint64

	Extra         []byte
	ExternalAttrs uint32 // Meaning depends on CreatorVersion
}

// FileInfo returns an fs.FileInfo for the [FileHeader].
func (h *FileHeader) FileInfo() fs.FileInfo {
	return headerFileInfo{h}
}

// headerFileInfo implements [fs.FileInfo].

All this renewal process, while still serving the app, is one of the main reasons why you would want to have a **separate system to handle HTTPS** with a TLS Termination Proxy instead of just using the TLS certificates with the application server directly (e.g. Uvicorn).

 * As such, the {@code *} character is treated as a wildcard and is used to represent any acceptable
 * type or subtype value. A media type may not have wildcard type with a declared subtype. The
 * {@code *} character has no special meaning as part of a parameter. All values for type, subtype,
 * parameter attributes or parameter values must be valid according to RFCs <a
 * href="https://tools.ietf.org/html/rfc2045">2045</a> and <a

    touch /etc/is_vagrant_vm
    touch /is_vagrant_vm # for consistency between linux and windows
  SHELL

  # This prevents leftovers from previous tests using the
  # same VM from messing up the current test
  config.vm.provision 'clean es installs in tmp', type: 'shell', inline: <<-SHELL
    rm -rf /tmp/elasticsearch*
  SHELL

  sh_set_prompt config, name
  sh_install_deps(
    config,

                        throw new InvalidUserDataException("Invalid json in "
                        + snippet.toString() + ". The error is:\n" + e.getMessage() + ".\n"
                        + "After substitutions and munging, the json looks like:\n" + quoted, e);
                    }
                }
                perSnippet(snippet)
                snippet = null
            }