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fix: validate iat and nbf on payload #568

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christiandavilakoobin
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If a JWT has a nonumeric iat or nbf value, it throws a FATAL error when validating the field.

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@@ -172,7 +182,7 @@ public static function decode(
}

// Check if this token has expired.
if (isset($payload->exp) && ($timestamp - static::$leeway) >= $payload->exp) {
if (isset($payload->exp) && floor($payload->exp) && ($timestamp - static::$leeway) >= $payload->exp) {

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the floor() change here is unnecessary if the exception has already been thrown above

@robocoder
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overlaps with #453

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