code: func GetOrDefaultBool(envVar string, defaultValue bool) bool {
  	v, err := strconv.ParseBool(GetOrFile(envVar))
  	if err != nil {
  		return defaultValue
  	}
  
  	return v
  }
docs: // GetOrDefaultBool returns the given environment variable value as a boolean.
  // Returns the default if the envvar cannot be coopered to a boolean, or is not found.