inmem_store.go
func NewInmemStore() *InmemStore {
	i := &InmemStore{
		logs:  make(map[uint64]*Log),
		kv:    make(map[string][]byte),
		kvInt: make(map[string]uint64),
	}
	return i
}
func NewInmemStore() *InmemStore {
	i := &InmemStore{
		logs:  make(map[uint64]*Log),
		kv:    make(map[string][]byte),
		kvInt: make(map[string]uint64),
	}
	return i
}
// NewInmemStore returns a new in-memory backend. Do not ever
// use for production. Only for testing.