How to understand when to use quotes, brackets in .yaml configuration?

Question

YAML

It is not entirely clear when to use and when not, it seems like they work the same way.
Example:

#https://symfony.com/doc/current/reference/configuration/framework.html#configuration

imports:
    - { resource: '../parameters_dev.yaml' }

imports:
    - { resource: ../parameters_dev.yaml }

the same with

validation:
        enabled: true 
// или
     enabled: 'true'

and so on, does it affect what? If not, then why put or not put brackets?

Answer 1

symfony.com/doc/current/components/yaml/yaml_forma...
From myself, I’ll say, true repeat your example c with false, then it will most likely become clear to you why this is needed ...
In PHP, the string, if not empty and not '0', then it true
returns php.net/manual/en/language.types .boolean.php