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Add Hint: Enclose bool variables in quotes when using dictionary #1976

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Add Hint: Enclose bool variables in quotes when using dictionary #1976

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6 changes: 5 additions & 1 deletion docs/yml.md
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Expand Up @@ -184,17 +184,21 @@ Mount all of the volumes from another service or container.

### environment

Add environment variables. You can use either an array or a dictionary.
Add environment variables. You can use either a dictionary or an array. Enclose
boolean variables in quotes to prevent them being parsed into True/False (capitalized)
when using a dictionary.

Environment variables with only a key are resolved to their values on the
machine Compose is running on, which can be helpful for secret or host-specific values.

environment:
RACK_ENV: development
SMTP_ENABLED: 'true'
SESSION_SECRET:

environment:
- RACK_ENV=development
- SMTP_ENABLED=true
- SESSION_SECRET

### env_file
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