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Explained some issues about command constructors and configure

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`@@ -61,6 +61,34 @@ method. Then you can optionally define a help message and the`
`61`	`61`	`;`
`62`	`62`	`}`
`63`	`63`
	`64`	+The ``configure()`` command is called automatically at the end of the command
	`65`	`+constructor. If your command defines its own constructor, set the properties`
	`66`	`+first and then call to the parent constructor, to make those properties`
	`67`	+available in the ``configure()`` method::
	`68`	`+`
	`69`	`+ class CreateUserCommand extends Command`
	`70`	`+ {`
	`71`	`+ // ...`
	`72`	`+`
	`73`	`+ public function __construct(bool $requirePassword = false)`
	`74`	`+ {`
	`75`	`+ // best practices recommend to call the parent constructor first and`
	`76`	`+ // then set your own properties. That wouldn't work in this case`
	`77`	`+ // because configure() needs the properties set in this constructor`
	`78`	`+ $this->requirePassword = $requirePassword;`
	`79`	`+`
	`80`	`+ parent::__construct();`
	`81`	`+ }`
	`82`	`+`
	`83`	`+ public function configure()`
	`84`	`+ {`
	`85`	`+ $this`
	`86`	`+ // ...`
	`87`	`+ ->addArgument('password', $this->requirePassword ? InputArgument::OPTIONAL : InputArgument::REQUIRED, 'User password')`
	`88`	`+ ;`
	`89`	`+ }`
	`90`	`+ }`
	`91`	`+`
`64`	`92`	`Registering the Command`
`65`	`93`	`-----------------------`
`66`	`94`

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