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Found 2 rules:

RoundingModeEnumRector

Replace rounding mode constant to RoundMode enum in round()

-round(1.5, 0, PHP_ROUND_HALF_UP);
+round(1.5, 0, RoundingMode::HalfAwayFromZero);
SETS:  PHP 8.4

ExplicitNullableParamTypeRector

Make implicit nullable param to explicit

-function foo(string $param = null) {}
+function foo(?string $param = null) {}
SETS:  PHP 8.4