[Validator] Used "::class" name resolution instead of "__NAMESPACE__" constant #19692
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The obscurity of building full Constraint class names by concatenating strings is removed. This could make it easier for some IDEs or other static analysis tools to identify usages of that specific class.
More details about "::class": http://php.net/manual/en/language.oop5.basic.php#language.oop5.basic.class.class
PS: It could be a good idea to apply this throughout the code, not just in Validator Component.