APPEND, PREPEND, INCR and DECR operations for compressed datatypes need to be handled by uncompressing both existing and delta values and aggregating and compressing the result.

APPEND, PREPEND, INCR and DECR operations for compressed datatypes need to be handled by uncompressing both existing and delta values and aggregating and compressing the result.
Steps to reproduce:
1)Store compressed document.
2)Append(or one of the mentioned operations) another compressed value to same key.
3)Server aggregates the two values as is.
4)Request GET for this key from 2.x client.
5)Server will try to snappy uncompress and throw exception as the doc in server is composite of two separate compressed docs.
6)client gets exception and connection is reset.