Una de las principales funcionalidades necesitadas por los sistemas API es la "<dfn title="también llamado marshalling, conversión">serialización</dfn>" de datos, que consiste en tomar datos del código (Python) y convertirlos en algo que pueda ser enviado a través de la red. Por ejemplo, convertir un objeto que contiene datos de una base de datos en un objeto JSON. Convertir objetos `datetime` en strings, etc.

   * {@snippet :
   * a   c
   * |   |
   * |   |
   * b   d
   * }
   */
  private static final SuccessorsFunction<Character> TWO_TREES = createDirectedGraph("ab", "cd");

  /**
   * A graph consisting of a single root {@code a}:
   *
   * {@snippet :
   * a
   * }
   */
  private static final SuccessorsFunction<Character> SINGLE_ROOT = createSingleRootGraph();

  /**

// version 1.0. The format of the sparse map consists of a series of
// newline-terminated numeric fields. The first field is the number of entries
// and is always present. Following this are the entries, consisting of two
// fields (offset, length). This function must stop reading at the end
// boundary of the block containing the last newline.
//
// Note that the GNU manual says that numeric values should be encoded in octal

			metaArr[index].ModTime = modTime
			metaArr[index].VersionID = versionID
			if !metaArr[index].InlineData() {
				// If the data is not inlined, we may end up incorrectly
				// inlining the data here, that leads to an inconsistent
				// situation where some objects are were not inlined
				// were now inlined, make sure to `nil` the Data such
				// that xl.meta is written as expected.
				metaArr[index].Data = nil
			}

> open connections to the database. This setting is generally NOT recommended as the behavior may be inconsistent during recursive deletes in `namespace` format.

  - A namespaced object with an ownerReference referencing a uid of a namespaced kind which does not exist in the same namespace is now consistently treated as though that owner does not exist, and the child object is deleted.

// string.
//
// See:
// http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html
//
// You should avoid the following characters in a key name because of
// significant special handling for consistency across all
// applications.
//
// Rejects strings with following characters.
//
// - Backslash ("\")
//
// additionally minio does not support object names with trailing SlashSeparator.

  these are intended for use in documentation, so please make it clear what
  you have done, and only do this where the benefit clearly outweighs the
  decrease in consistency.
* Note that Javadoc and block comments i.e. `/* ... */` are not formatted,
  but line comments i.e `// ...` are.
* Negative boolean expressions must use the form `foo == false` instead of

break outside\n  overflow: auto;\n  // Disable auto-hiding scrollbar in IE & legacy Edge to avoid overlap,\n  // making it impossible to interact with the content\n  -ms-overflow-style: scrollbar;\n}\n\n\n//\n// Figures\n//\n\nfigure {\n  // Apply a consistent margin strategy (matches our type styles).\n  margin: 0 0 1rem;\n}\n\n\n//\n// Images and content\n//\n\nimg {\n  vertical-align: middle;\n  border-style: none; // Remove the border on images inside links in IE 10-.\n}\n\nsvg {\n  // Workaround...

      }
    assertValue("a", "a", "a")
    assertValue("b", "b", "b")
    assertAbsent("c")
    assertAbsent("d")
  }

  /**
   * We had a bug where the cache was left in an inconsistent state after a journal write failed.
   * https://github.com/square/okhttp/issues/1211
   */
  @Test
  fun journalWriteFailsDuringEditorCommit() {
    set("a", "a", "a")
    set("b", "b", "b")