Message about invalid credentials with "{}" in config

Hi! For some reason, when using the "something{something_else}" construct in "roles/names", I get an error about invalid credentials.

ldap2pg.yml

Good config:

version: 6

postgres:
  databases_query: [postgres]

privileges:
  ro:
  - __connect__
  - __select_on_tables__
  - __select_on_sequences__
  - __usage_on_schemas__
  - __usage_on_types__

  rw:
  - __temporary__
  - __all_on_tables__
  - __all_on_sequences__

  ddl:
  - __create_on_schemas__

rules:
- description: "..."
  ldapsearch:
    base: cn=admin,dc=test,dc=com
    filter: ""

- description: "Setup static roles and grants."
  roles:
  - names:
    - readers
    options: NOLOGIN
  - name: writers
    parent: readers
    options: NOLOGIN
  - name: owners
    parent: writers
    options: NOLOGIN

  - names:
    - AA
    options: NOLOGIN

  grant:
  - privilege: ro
    role: readers
  - privilege: rw
    role: writers
  - privilege: ddl
    role: owners

However, when I change AA to AA{}, I get an error:

  - names:
    - AA{} # or "AA{}"
    options: NOLOGIN

Expectations

I don't quite understand why this is happening, but I think it looks like a bug.

Verbose output of ldap2pg execution

Verbose output

Start by reproducing the issue with the supplied ldap2pg.yml, comparing the working AA value with AA{} and reviewing the attached verbose output. Trace how the names value is interpreted before the invalid-credentials error; done means the behavior is corrected or clearly explained for names containing {}.