CHANGELOG
=========
+3.4.0
+-----
+
+ * added support for parsing YAML files using the `Yaml::parseFile()` or `Parser::parseFile()` method
+
+ * the `Dumper`, `Parser`, and `Yaml` classes are marked as final
+
+ * Deprecated the `!php/object:` tag which will be replaced by the
+ `!php/object` tag (without the colon) in 4.0.
+
+ * Deprecated the `!php/const:` tag which will be replaced by the
+ `!php/const` tag (without the colon) in 4.0.
+
+ * Support for the `!str` tag is deprecated, use the `!!str` tag instead.
+
+ * Deprecated using the non-specific tag `!` as its behavior will change in 4.0.
+ It will force non-evaluating your values in 4.0. Use plain integers or `!!float` instead.
+
+3.3.0
+-----
+
+ * Starting an unquoted string with a question mark followed by a space is
+ deprecated and will throw a `ParseException` in Symfony 4.0.
+
+ * Deprecated support for implicitly parsing non-string mapping keys as strings.
+ Mapping keys that are no strings will lead to a `ParseException` in Symfony
+ 4.0. Use quotes to opt-in for keys to be parsed as strings.
+
+ Before:
+
+ ```php
+ $yaml = <<<YAML
+ null: null key
+ true: boolean true
+ 2.0: float key
+ YAML;
+
+ Yaml::parse($yaml);
+ ```
+
+ After:
+
+ ```php
+
+ $yaml = <<<YAML
+ "null": null key
+ "true": boolean true
+ "2.0": float key
+ YAML;
+
+ Yaml::parse($yaml);
+ ```
+
+ * Omitted mapping values will be parsed as `null`.
+
+ * Omitting the key of a mapping is deprecated and will throw a `ParseException` in Symfony 4.0.
+
+ * Added support for dumping empty PHP arrays as YAML sequences:
+
+ ```php
+ Yaml::dump([], 0, 0, Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE);
+ ```
+
3.2.0
-----