Issue Description

While using model.bulkCreate, as we pass the options, an object which contains transaction, it comes modified after the execution

What are you doing?

We have called bulk

Tarantool version: 2.3

tarantool> key_def.new({{field = 1, type = nil}})
---
- error: type must not be nil
...
tarantool> key_def.new({{field = 1, type = box.NULL}}) -- Expected the same error as for first case
---
- - type: unsigned
    is_nullable: false
    fieldno: 1
...

Benchmarks and features make it sound promising for our workloads. AWS runs exclusively on Intel hardware, so we'll be able to make use of the CPU-specific optimizations in Clear Linux. We'll need to verify that Pan

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