feedback: Submodule box.schema

[TarantoolBot]

<…>ork:
COPYbox.space.T:insert{nil,0}tarantool> box.space.T:insert{|nil|,0}

• [1, 0]
  ...

Note
The index key type may be either ‘i<…>

https://www.tarantool.io/en/doc/2.2/reference/reference_lua/box_schema/#lua-function.space_object.create_index

nil in arrays should be written as box.NULL