Serializer: add primitive value serializers
Serializer: add primitive value serializers

ffjiao/mapdb,codeaudit/mapdb,sumit784/mapdb,jankotek/MapDB,SleimanJneidi/mapdb,jankotek/mapdb,pettermahlen/mapdb,cocosli/mapdb,hangum/mapdb,lamfire/mapdb,ringoluo/mapdb,jankotek/MapDB,binarytemple/mapdb,jankotek/mapdb,morfeo8marc/mapdb