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[Validation] Mention the option to pass stringable objects

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Original file line number	Diff line number	Diff line change
@@ -85,13 +85,19 @@ The validator class is also simple, and only has one required method ``validate(
`85`	`85`	`}`
`86`	`86`
`87`	`87`	`if (!preg_match('/^[a-zA-Z0-9]+$/', $value, $matches)) {`
	`88`	`+ // the argument must be a string or an object implementing __toString()`
`88`	`89`	`$this->context->buildViolation($constraint->message)`
`89`	`90`	`->setParameter('{{ string }}', $value)`
`90`	`91`	`->addViolation();`
`91`	`92`	`}`
`92`	`93`	`}`
`93`	`94`	`}`
`94`	`95`
	`96`	`+..versionadded::4.4`
	`97`	`+`
	`98`	+ The feature to allow passing an object as the ``buildViolation()`` argument
	`99`	`+ was introduced in Symfony 4.4.`
	`100`	`+`
`95`	`101`	Inside ``validate``, you don't need to return a value. Instead, you add violations
`96`	`102`	to the validator's ``context`` property and a value will be considered valid
`97`	`103`	if it causes no violations. The ``buildViolation()`` method takes the error

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