Thanks to visit codestin.com Credit goes to github.com
#no-ticket * fix serialization bug
#no-ticket * add $prefer_old to merge()
#24 * add test for Map filter()
#6 * use serializable interface * add tests * update readme
#15 Map: add map() method
#14 Collection: add unique() method
Merge remote-tracking branch 'origin/master'
Collection: construct recursive #8
bugfix #8