CHANGELOG

2.8.0

Deprecated usage of a colon in an unquoted mapping value
Deprecated usage of @, `, | and > at the beginning of an unquoted string
When surrounding strings with double-quotes, you must now escape \ characters. Not escaping those characters (when surrounded by double-quotes) is deprecated.

Before:

   class: "Foo\Var"

After:

   class: "Foo\\Var"

2.1.0

Yaml::parse() does not evaluate loaded files as PHP files by default anymore (call Yaml::enablePhpParsing() to get back the old behavior)