Непонятное Тарантул

tnt.log

texchange.tnt.nowtaxi.ru:3301> box.space.tst:select()
---
- - ['tst 1', 0]
  - ['tst 1', 1]
  - ['tst 1', 2]
  - ['tst 1', 3]
  - ['tst 1', 4]
  - ['tst 1', 5]
  - ['tst 1', 6]
  - ['tst 1', 7]
  - ['tst 1', 8]
  - ['tst 1', 9]
  - ['tst 2', 10]
  - ['tst 3', 0]
  - ['tst 3', 1]
  - ['tst 3', 2]
  - ['tst 3', 3]
  - ['tst 3', 4]
  - ['tst 3', 5]
  - ['tst 3', 6]
  - ['tst 3', 7]
  - ['tst 3', 8]
  - ['tst 3', 9]
...

texchange.tnt.nowtaxi.ru:3301> box.space.tst.index.key:min{'atst 1'}
---
- ['tst 1', 0]
...

texchange.tnt.nowtaxi.ru:3301> box.space.tst.index.key:max{'atst 1'}
---
...

texchange.tnt.nowtaxi.ru:3301> box.space.tst
---
- id: 539
  before_replace: 'function: 0x40223000'
  on_replace: 'function: 0x4180f9f0'
  temporary: true
  index:
    0: &0
      unique: true
      parts:
      - type: string
        is_nullable: false
        fieldno: 1
      - type: unsigned
        is_nullable: false
        fieldno: 2
      id: 0
      space_id: 539
      name: key
      type: TREE
    key: *0
  field_count: 0
  enabled: true
  name: tst
  engine: memtx
...

texchange.tnt.nowtaxi.ru:3301> box.info
---
- version: 1.9.1-27-gf9299c43d
  id: 1
  ro: false
  vinyl: []
  vclock: {1: 1095672}
  uptime: 185768
  lsn: 1095672
  memory: []
  cluster:
    uuid: c38f354c-83c0-43d7-a5be-ba271856b4d8
  pid: 9800
  status: running
  signature: 1095672
  replication:
    1:
      id: 1
      uuid: 55b0ddf1-e2b2-4648-8f5b-903fa40f76fa
      lsn: 1095672
  uuid: 55b0ddf1-e2b2-4648-8f5b-903fa40f76fa
...