Tendermint version (use tendermint version or git rev-parse --verify HEAD if installed from source):

develop

What happened:

Manual code review of the BoltDB backend.

Anything else we need to know:

One of these things is not like the others
One of these things just doesn't belong
Can you tell which thing is not like the others
By the time I finish my song?

• tendermint/libs/db/boltdb.go

  Line 183 in 96e132b

  func (bdb *boltDBBatch) Delete(key []byte) {

• tendermint/libs/db/c_level_db.go

  Line 169 in 96e132b

  func (mBatch *cLevelDBBatch) Delete(key []byte) {

• tendermint/libs/db/go_level_db.go

  Line 164 in 96e132b

  func (mBatch *goLevelDBBatch) Delete(key []byte) {

• tendermint/libs/db/mem_batch.go

  Line 35 in 96e132b

  func (mBatch *memBatch) Delete(key []byte) {