Release 3.1.1

• fix serialization bug

Release 3.1.0

• add $prefer_old option to merge()

Release 3.0.1

• add filter() method to Map #24

Release 3.0.0

• implement \Serializable interface #6
• options for Map and Collection as array parameter #10
• implement \ArrayAccess interface #12
• add getType method to Map and Collection #16
• implement \Iterable interface in Collection #18
• other small changes, improvements documentation and tests

Release 2.10.0

• Map: add map() method #15

Release 2.9.0

• Collection: add unique() method #14

Release 2.8.0

• add PSR-2 compatibility #13

Release 2.7.2

• add recursive construct for Collection

Release 2.7.1

• Bugfix #8

Release 2.7.0

• Map: construct recursive #8
• Map: add hasKeys() method #7