Can't set a numeric session variable using user_session_vars section of config.yaml

[timsehn]

With the following config .yaml:

user_saession_vars:
- user: "root"
   vars:
     "dolt_show_system_tables": 1  

I get the folloowing error after connecting to root to that server:

ERRO[0023] unable to process ComInitDB: Variable 'dolt_show_system_tables' can't be set to the value of '1'  database=config_blog

Same with autocommit

MySQL [(none)]> select @@autocommit;
ERROR 1105 (HY000): Variable 'autocommit' can't be set to the value of '0'

However, string variables seems fine:

user_session_vars:
- name: "root"
  vars:
    "version": "the best"

And on the client:

MySQL [(none)]> select @@version;
+-----------+
| @@version |
+-----------+
| the best  |
+-----------+
1 row in set (0.001 sec)