Symfony version(s) affected

6.4.8

Description

I'm updating my app from symfony v6.1.12 to v6.4.8 and behavior of env processor changed.

Before update env %env(string:default::ENV_NAME)% return null, but now it return empty string.

I found some PRs and issues, but there was fix to fix to fix, and I'm little bit confused what is the right way.

1. [DependencyInjection] Fix casting scalar env vars from null #50517

2. [DependencyInjection] Fix autocasting null env values to empty string #50837

3. [DependencyInjection] Fix autocasting null env values to empty string with container.env_var_processors_locator #51198

4. Environment variable typecast processors return null when used in conjunction with default: #50415

5. Null environment variable cast to empty string #50815

In documentation there is "When the fallback parameter is omitted (e.g. env(default::API_KEY)), then the returned value is null.". I think 3rd PR says that null value shouldn't be casted to empty string.

Also, I modified my env to default::ENV_NAME and i have the same problem as described here

Invalid type for path "infrastructure_tools.healthChecks.baseAuthUser". Exp  
  ected one of "bool", "int", "float", "string", but got one of "bool", "int"  
  , "float", "string", "array". 

How to reproduce

Pass the following as an argument to a Symfony service. Do not set the value of ENV.

final class EnvironmentService
{
    public function __construct(
        private ?string $env,
    ) {}
}

# services.yaml
\EnvironmentService:
  arguments:
    $env: '%env(string:default::ENV)%'

Symfony container build will fail due to null being passed as the $boolFlag which has to be a bool.

Possible Solution

No response

Additional Context

No response