diff --git a/ext/random/tests/02_engine/all_serialize_user.phpt b/ext/random/tests/02_engine/all_serialize_user.phpt
index c650f4f561d..6cf3870d2c9 100644
--- a/ext/random/tests/02_engine/all_serialize_user.phpt
+++ b/ext/random/tests/02_engine/all_serialize_user.phpt
@@ -4,22 +4,13 @@ Random: Engine: Serialization of user engines must preserve the sequence
 <?php
 
 use Random\Engine;
+use Random\Engine\Test\TestCountingEngine32;
 use Random\Engine\Test\TestShaEngine;
 
 require __DIR__ . "/../engines.inc";
 
-final class CountingEngine32 implements Engine
-{
-    private int $count = 0;
-
-    public function generate(): string
-    {
-        return pack('V', ++$this->count);
-    }
-}
-
 $engines = [];
-$engines[] = new CountingEngine32();
+$engines[] = new TestCountingEngine32();
 $engines[] = new TestShaEngine();
 $iterations = getenv("SKIP_SLOW_TESTS") ? 3_000 : 10_000;
 
@@ -43,6 +34,6 @@ die('success');
 
 ?>
 --EXPECT--
-CountingEngine32
+Random\Engine\Test\TestCountingEngine32
 Random\Engine\Test\TestShaEngine
 success
diff --git a/ext/random/tests/03_randomizer/methods/getFloat_equal_steps.phpt b/ext/random/tests/03_randomizer/methods/getFloat_equal_steps.phpt
new file mode 100644
index 00000000000..ce556db6095
--- /dev/null
+++ b/ext/random/tests/03_randomizer/methods/getFloat_equal_steps.phpt
@@ -0,0 +1,434 @@
+--TEST--
+Random: Randomizer: getFloat(): Returned floats have equal distance.
+--FILE--
+<?php
+
+use Random\Engine;
+use Random\Engine\Test\TestCountingEngine64;
+use Random\IntervalBoundary;
+use Random\Randomizer;
+
+require __DIR__ . "/../../engines.inc";
+
+function run_test(Randomizer $r, float $min, float $max, int $count) {
+    printf("[%.17g, %.17g]\n", $min, $max);
+
+    $prev = null;
+    for ($i = 0; $i < $count; $i++) {
+        $float = $r->getFloat($min, $max, IntervalBoundary::ClosedClosed);
+        printf("%.17f", $float);
+        if ($prev !== null) {
+            printf(" (%+.17g)", ($float - $prev));
+
+            if ($prev < $float) {
+                printf("\nRepeat");
+            }
+        }
+        printf("\n");
+
+        $prev = $float;
+    }
+}
+
+run_test(
+    new Randomizer(new TestCountingEngine64()),
+    1.99999999999999,
+    2.00000000000001,
+    150,
+);
+
+echo "==================", PHP_EOL, PHP_EOL;
+
+run_test(
+    new Randomizer(new TestCountingEngine64()),
+    1.99999999999999,
+    2.00000000000000,
+    150,
+);
+
+echo "==================", PHP_EOL, PHP_EOL;
+
+run_test(
+    new Randomizer(new TestCountingEngine64()),
+    2.00000000000000,
+    2.00000000000001,
+    60,
+);
+
+?>
+--EXPECT--
+[1.99999999999999, 2.0000000000000102]
+2.00000000000001021
+2.00000000000000977 (-4.4408920985006262e-16)
+2.00000000000000933 (-4.4408920985006262e-16)
+2.00000000000000888 (-4.4408920985006262e-16)
+2.00000000000000844 (-4.4408920985006262e-16)
+2.00000000000000799 (-4.4408920985006262e-16)
+2.00000000000000755 (-4.4408920985006262e-16)
+2.00000000000000711 (-4.4408920985006262e-16)
+2.00000000000000666 (-4.4408920985006262e-16)
+2.00000000000000622 (-4.4408920985006262e-16)
+2.00000000000000577 (-4.4408920985006262e-16)
+2.00000000000000533 (-4.4408920985006262e-16)
+2.00000000000000488 (-4.4408920985006262e-16)
+2.00000000000000444 (-4.4408920985006262e-16)
+2.00000000000000400 (-4.4408920985006262e-16)
+2.00000000000000355 (-4.4408920985006262e-16)
+2.00000000000000311 (-4.4408920985006262e-16)
+2.00000000000000266 (-4.4408920985006262e-16)
+2.00000000000000222 (-4.4408920985006262e-16)
+2.00000000000000178 (-4.4408920985006262e-16)
+2.00000000000000133 (-4.4408920985006262e-16)
+2.00000000000000089 (-4.4408920985006262e-16)
+2.00000000000000044 (-4.4408920985006262e-16)
+2.00000000000000000 (-4.4408920985006262e-16)
+1.99999999999999956 (-4.4408920985006262e-16)
+1.99999999999999911 (-4.4408920985006262e-16)
+1.99999999999999867 (-4.4408920985006262e-16)
+1.99999999999999822 (-4.4408920985006262e-16)
+1.99999999999999778 (-4.4408920985006262e-16)
+1.99999999999999734 (-4.4408920985006262e-16)
+1.99999999999999689 (-4.4408920985006262e-16)
+1.99999999999999645 (-4.4408920985006262e-16)
+1.99999999999999600 (-4.4408920985006262e-16)
+1.99999999999999556 (-4.4408920985006262e-16)
+1.99999999999999512 (-4.4408920985006262e-16)
+1.99999999999999467 (-4.4408920985006262e-16)
+1.99999999999999423 (-4.4408920985006262e-16)
+1.99999999999999378 (-4.4408920985006262e-16)
+1.99999999999999334 (-4.4408920985006262e-16)
+1.99999999999999289 (-4.4408920985006262e-16)
+1.99999999999999245 (-4.4408920985006262e-16)
+1.99999999999999201 (-4.4408920985006262e-16)
+1.99999999999999156 (-4.4408920985006262e-16)
+1.99999999999999112 (-4.4408920985006262e-16)
+1.99999999999999067 (-4.4408920985006262e-16)
+1.99999999999999023 (-4.4408920985006262e-16)
+1.99999999999999001 (-2.2204460492503131e-16)
+2.00000000000001021 (+2.0206059048177849e-14)
+Repeat
+2.00000000000000977 (-4.4408920985006262e-16)
+2.00000000000000933 (-4.4408920985006262e-16)
+2.00000000000000888 (-4.4408920985006262e-16)
+2.00000000000000844 (-4.4408920985006262e-16)
+2.00000000000000799 (-4.4408920985006262e-16)
+2.00000000000000755 (-4.4408920985006262e-16)
+2.00000000000000711 (-4.4408920985006262e-16)
+2.00000000000000666 (-4.4408920985006262e-16)
+2.00000000000000622 (-4.4408920985006262e-16)
+2.00000000000000577 (-4.4408920985006262e-16)
+2.00000000000000533 (-4.4408920985006262e-16)
+2.00000000000000488 (-4.4408920985006262e-16)
+2.00000000000000444 (-4.4408920985006262e-16)
+2.00000000000000400 (-4.4408920985006262e-16)
+2.00000000000000355 (-4.4408920985006262e-16)
+2.00000000000000311 (-4.4408920985006262e-16)
+2.00000000000000266 (-4.4408920985006262e-16)
+2.00000000000000222 (-4.4408920985006262e-16)
+2.00000000000000178 (-4.4408920985006262e-16)
+2.00000000000000133 (-4.4408920985006262e-16)
+2.00000000000000089 (-4.4408920985006262e-16)
+2.00000000000000044 (-4.4408920985006262e-16)
+2.00000000000000000 (-4.4408920985006262e-16)
+1.99999999999999956 (-4.4408920985006262e-16)
+1.99999999999999911 (-4.4408920985006262e-16)
+1.99999999999999867 (-4.4408920985006262e-16)
+1.99999999999999822 (-4.4408920985006262e-16)
+1.99999999999999778 (-4.4408920985006262e-16)
+1.99999999999999734 (-4.4408920985006262e-16)
+1.99999999999999689 (-4.4408920985006262e-16)
+1.99999999999999645 (-4.4408920985006262e-16)
+1.99999999999999600 (-4.4408920985006262e-16)
+1.99999999999999556 (-4.4408920985006262e-16)
+1.99999999999999512 (-4.4408920985006262e-16)
+1.99999999999999467 (-4.4408920985006262e-16)
+1.99999999999999423 (-4.4408920985006262e-16)
+1.99999999999999378 (-4.4408920985006262e-16)
+1.99999999999999334 (-4.4408920985006262e-16)
+1.99999999999999289 (-4.4408920985006262e-16)
+1.99999999999999245 (-4.4408920985006262e-16)
+1.99999999999999201 (-4.4408920985006262e-16)
+1.99999999999999156 (-4.4408920985006262e-16)
+1.99999999999999112 (-4.4408920985006262e-16)
+1.99999999999999067 (-4.4408920985006262e-16)
+1.99999999999999023 (-4.4408920985006262e-16)
+1.99999999999999001 (-2.2204460492503131e-16)
+2.00000000000001021 (+2.0206059048177849e-14)
+Repeat
+2.00000000000000977 (-4.4408920985006262e-16)
+2.00000000000000933 (-4.4408920985006262e-16)
+2.00000000000000888 (-4.4408920985006262e-16)
+2.00000000000000844 (-4.4408920985006262e-16)
+2.00000000000000799 (-4.4408920985006262e-16)
+2.00000000000000755 (-4.4408920985006262e-16)
+2.00000000000000711 (-4.4408920985006262e-16)
+2.00000000000000666 (-4.4408920985006262e-16)
+2.00000000000000622 (-4.4408920985006262e-16)
+2.00000000000000577 (-4.4408920985006262e-16)
+2.00000000000000533 (-4.4408920985006262e-16)
+2.00000000000000488 (-4.4408920985006262e-16)
+2.00000000000000444 (-4.4408920985006262e-16)
+2.00000000000000400 (-4.4408920985006262e-16)
+2.00000000000000355 (-4.4408920985006262e-16)
+2.00000000000000311 (-4.4408920985006262e-16)
+2.00000000000000266 (-4.4408920985006262e-16)
+2.00000000000000222 (-4.4408920985006262e-16)
+2.00000000000000178 (-4.4408920985006262e-16)
+2.00000000000000133 (-4.4408920985006262e-16)
+2.00000000000000089 (-4.4408920985006262e-16)
+2.00000000000000044 (-4.4408920985006262e-16)
+2.00000000000000000 (-4.4408920985006262e-16)
+1.99999999999999956 (-4.4408920985006262e-16)
+1.99999999999999911 (-4.4408920985006262e-16)
+1.99999999999999867 (-4.4408920985006262e-16)
+1.99999999999999822 (-4.4408920985006262e-16)
+1.99999999999999778 (-4.4408920985006262e-16)
+1.99999999999999734 (-4.4408920985006262e-16)
+1.99999999999999689 (-4.4408920985006262e-16)
+1.99999999999999645 (-4.4408920985006262e-16)
+1.99999999999999600 (-4.4408920985006262e-16)
+1.99999999999999556 (-4.4408920985006262e-16)
+1.99999999999999512 (-4.4408920985006262e-16)
+1.99999999999999467 (-4.4408920985006262e-16)
+1.99999999999999423 (-4.4408920985006262e-16)
+1.99999999999999378 (-4.4408920985006262e-16)
+1.99999999999999334 (-4.4408920985006262e-16)
+1.99999999999999289 (-4.4408920985006262e-16)
+1.99999999999999245 (-4.4408920985006262e-16)
+1.99999999999999201 (-4.4408920985006262e-16)
+1.99999999999999156 (-4.4408920985006262e-16)
+1.99999999999999112 (-4.4408920985006262e-16)
+1.99999999999999067 (-4.4408920985006262e-16)
+1.99999999999999023 (-4.4408920985006262e-16)
+1.99999999999999001 (-2.2204460492503131e-16)
+2.00000000000001021 (+2.0206059048177849e-14)
+Repeat
+2.00000000000000977 (-4.4408920985006262e-16)
+2.00000000000000933 (-4.4408920985006262e-16)
+2.00000000000000888 (-4.4408920985006262e-16)
+2.00000000000000844 (-4.4408920985006262e-16)
+2.00000000000000799 (-4.4408920985006262e-16)
+2.00000000000000755 (-4.4408920985006262e-16)
+2.00000000000000711 (-4.4408920985006262e-16)
+2.00000000000000666 (-4.4408920985006262e-16)
+==================
+
+[1.99999999999999, 2]
+2.00000000000000000
+1.99999999999999978 (-2.2204460492503131e-16)
+1.99999999999999956 (-2.2204460492503131e-16)
+1.99999999999999933 (-2.2204460492503131e-16)
+1.99999999999999911 (-2.2204460492503131e-16)
+1.99999999999999889 (-2.2204460492503131e-16)
+1.99999999999999867 (-2.2204460492503131e-16)
+1.99999999999999845 (-2.2204460492503131e-16)
+1.99999999999999822 (-2.2204460492503131e-16)
+1.99999999999999800 (-2.2204460492503131e-16)
+1.99999999999999778 (-2.2204460492503131e-16)
+1.99999999999999756 (-2.2204460492503131e-16)
+1.99999999999999734 (-2.2204460492503131e-16)
+1.99999999999999711 (-2.2204460492503131e-16)
+1.99999999999999689 (-2.2204460492503131e-16)
+1.99999999999999667 (-2.2204460492503131e-16)
+1.99999999999999645 (-2.2204460492503131e-16)
+1.99999999999999623 (-2.2204460492503131e-16)
+1.99999999999999600 (-2.2204460492503131e-16)
+1.99999999999999578 (-2.2204460492503131e-16)
+1.99999999999999556 (-2.2204460492503131e-16)
+1.99999999999999534 (-2.2204460492503131e-16)
+1.99999999999999512 (-2.2204460492503131e-16)
+1.99999999999999489 (-2.2204460492503131e-16)
+1.99999999999999467 (-2.2204460492503131e-16)
+1.99999999999999445 (-2.2204460492503131e-16)
+1.99999999999999423 (-2.2204460492503131e-16)
+1.99999999999999400 (-2.2204460492503131e-16)
+1.99999999999999378 (-2.2204460492503131e-16)
+1.99999999999999356 (-2.2204460492503131e-16)
+1.99999999999999334 (-2.2204460492503131e-16)
+1.99999999999999312 (-2.2204460492503131e-16)
+1.99999999999999289 (-2.2204460492503131e-16)
+1.99999999999999267 (-2.2204460492503131e-16)
+1.99999999999999245 (-2.2204460492503131e-16)
+1.99999999999999223 (-2.2204460492503131e-16)
+1.99999999999999201 (-2.2204460492503131e-16)
+1.99999999999999178 (-2.2204460492503131e-16)
+1.99999999999999156 (-2.2204460492503131e-16)
+1.99999999999999134 (-2.2204460492503131e-16)
+1.99999999999999112 (-2.2204460492503131e-16)
+1.99999999999999090 (-2.2204460492503131e-16)
+1.99999999999999067 (-2.2204460492503131e-16)
+1.99999999999999045 (-2.2204460492503131e-16)
+1.99999999999999023 (-2.2204460492503131e-16)
+1.99999999999999001 (-2.2204460492503131e-16)
+2.00000000000000000 (+9.9920072216264089e-15)
+Repeat
+1.99999999999999978 (-2.2204460492503131e-16)
+1.99999999999999956 (-2.2204460492503131e-16)
+1.99999999999999933 (-2.2204460492503131e-16)
+1.99999999999999911 (-2.2204460492503131e-16)
+1.99999999999999889 (-2.2204460492503131e-16)
+1.99999999999999867 (-2.2204460492503131e-16)
+1.99999999999999845 (-2.2204460492503131e-16)
+1.99999999999999822 (-2.2204460492503131e-16)
+1.99999999999999800 (-2.2204460492503131e-16)
+1.99999999999999778 (-2.2204460492503131e-16)
+1.99999999999999756 (-2.2204460492503131e-16)
+1.99999999999999734 (-2.2204460492503131e-16)
+1.99999999999999711 (-2.2204460492503131e-16)
+1.99999999999999689 (-2.2204460492503131e-16)
+1.99999999999999667 (-2.2204460492503131e-16)
+1.99999999999999645 (-2.2204460492503131e-16)
+1.99999999999999623 (-2.2204460492503131e-16)
+1.99999999999999600 (-2.2204460492503131e-16)
+1.99999999999999578 (-2.2204460492503131e-16)
+1.99999999999999556 (-2.2204460492503131e-16)
+1.99999999999999534 (-2.2204460492503131e-16)
+1.99999999999999512 (-2.2204460492503131e-16)
+1.99999999999999489 (-2.2204460492503131e-16)
+1.99999999999999467 (-2.2204460492503131e-16)
+1.99999999999999445 (-2.2204460492503131e-16)
+1.99999999999999423 (-2.2204460492503131e-16)
+1.99999999999999400 (-2.2204460492503131e-16)
+1.99999999999999378 (-2.2204460492503131e-16)
+1.99999999999999356 (-2.2204460492503131e-16)
+1.99999999999999334 (-2.2204460492503131e-16)
+1.99999999999999312 (-2.2204460492503131e-16)
+1.99999999999999289 (-2.2204460492503131e-16)
+1.99999999999999267 (-2.2204460492503131e-16)
+1.99999999999999245 (-2.2204460492503131e-16)
+1.99999999999999223 (-2.2204460492503131e-16)
+1.99999999999999201 (-2.2204460492503131e-16)
+1.99999999999999178 (-2.2204460492503131e-16)
+1.99999999999999156 (-2.2204460492503131e-16)
+1.99999999999999134 (-2.2204460492503131e-16)
+1.99999999999999112 (-2.2204460492503131e-16)
+1.99999999999999090 (-2.2204460492503131e-16)
+1.99999999999999067 (-2.2204460492503131e-16)
+1.99999999999999045 (-2.2204460492503131e-16)
+1.99999999999999023 (-2.2204460492503131e-16)
+1.99999999999999001 (-2.2204460492503131e-16)
+2.00000000000000000 (+9.9920072216264089e-15)
+Repeat
+1.99999999999999978 (-2.2204460492503131e-16)
+1.99999999999999956 (-2.2204460492503131e-16)
+1.99999999999999933 (-2.2204460492503131e-16)
+1.99999999999999911 (-2.2204460492503131e-16)
+1.99999999999999889 (-2.2204460492503131e-16)
+1.99999999999999867 (-2.2204460492503131e-16)
+1.99999999999999845 (-2.2204460492503131e-16)
+1.99999999999999822 (-2.2204460492503131e-16)
+1.99999999999999800 (-2.2204460492503131e-16)
+1.99999999999999778 (-2.2204460492503131e-16)
+1.99999999999999756 (-2.2204460492503131e-16)
+1.99999999999999734 (-2.2204460492503131e-16)
+1.99999999999999711 (-2.2204460492503131e-16)
+1.99999999999999689 (-2.2204460492503131e-16)
+1.99999999999999667 (-2.2204460492503131e-16)
+1.99999999999999645 (-2.2204460492503131e-16)
+1.99999999999999623 (-2.2204460492503131e-16)
+1.99999999999999600 (-2.2204460492503131e-16)
+1.99999999999999578 (-2.2204460492503131e-16)
+1.99999999999999556 (-2.2204460492503131e-16)
+1.99999999999999534 (-2.2204460492503131e-16)
+1.99999999999999512 (-2.2204460492503131e-16)
+1.99999999999999489 (-2.2204460492503131e-16)
+1.99999999999999467 (-2.2204460492503131e-16)
+1.99999999999999445 (-2.2204460492503131e-16)
+1.99999999999999423 (-2.2204460492503131e-16)
+1.99999999999999400 (-2.2204460492503131e-16)
+1.99999999999999378 (-2.2204460492503131e-16)
+1.99999999999999356 (-2.2204460492503131e-16)
+1.99999999999999334 (-2.2204460492503131e-16)
+1.99999999999999312 (-2.2204460492503131e-16)
+1.99999999999999289 (-2.2204460492503131e-16)
+1.99999999999999267 (-2.2204460492503131e-16)
+1.99999999999999245 (-2.2204460492503131e-16)
+1.99999999999999223 (-2.2204460492503131e-16)
+1.99999999999999201 (-2.2204460492503131e-16)
+1.99999999999999178 (-2.2204460492503131e-16)
+1.99999999999999156 (-2.2204460492503131e-16)
+1.99999999999999134 (-2.2204460492503131e-16)
+1.99999999999999112 (-2.2204460492503131e-16)
+1.99999999999999090 (-2.2204460492503131e-16)
+1.99999999999999067 (-2.2204460492503131e-16)
+1.99999999999999045 (-2.2204460492503131e-16)
+1.99999999999999023 (-2.2204460492503131e-16)
+1.99999999999999001 (-2.2204460492503131e-16)
+2.00000000000000000 (+9.9920072216264089e-15)
+Repeat
+1.99999999999999978 (-2.2204460492503131e-16)
+1.99999999999999956 (-2.2204460492503131e-16)
+1.99999999999999933 (-2.2204460492503131e-16)
+1.99999999999999911 (-2.2204460492503131e-16)
+1.99999999999999889 (-2.2204460492503131e-16)
+1.99999999999999867 (-2.2204460492503131e-16)
+1.99999999999999845 (-2.2204460492503131e-16)
+1.99999999999999822 (-2.2204460492503131e-16)
+1.99999999999999800 (-2.2204460492503131e-16)
+1.99999999999999778 (-2.2204460492503131e-16)
+1.99999999999999756 (-2.2204460492503131e-16)
+==================
+
+[2, 2.0000000000000102]
+2.00000000000001021
+2.00000000000000977 (-4.4408920985006262e-16)
+2.00000000000000933 (-4.4408920985006262e-16)
+2.00000000000000888 (-4.4408920985006262e-16)
+2.00000000000000844 (-4.4408920985006262e-16)
+2.00000000000000799 (-4.4408920985006262e-16)
+2.00000000000000755 (-4.4408920985006262e-16)
+2.00000000000000711 (-4.4408920985006262e-16)
+2.00000000000000666 (-4.4408920985006262e-16)
+2.00000000000000622 (-4.4408920985006262e-16)
+2.00000000000000577 (-4.4408920985006262e-16)
+2.00000000000000533 (-4.4408920985006262e-16)
+2.00000000000000488 (-4.4408920985006262e-16)
+2.00000000000000444 (-4.4408920985006262e-16)
+2.00000000000000400 (-4.4408920985006262e-16)
+2.00000000000000355 (-4.4408920985006262e-16)
+2.00000000000000311 (-4.4408920985006262e-16)
+2.00000000000000266 (-4.4408920985006262e-16)
+2.00000000000000222 (-4.4408920985006262e-16)
+2.00000000000000178 (-4.4408920985006262e-16)
+2.00000000000000133 (-4.4408920985006262e-16)
+2.00000000000000089 (-4.4408920985006262e-16)
+2.00000000000000044 (-4.4408920985006262e-16)
+2.00000000000000000 (-4.4408920985006262e-16)
+2.00000000000001021 (+1.021405182655144e-14)
+Repeat
+2.00000000000000977 (-4.4408920985006262e-16)
+2.00000000000000933 (-4.4408920985006262e-16)
+2.00000000000000888 (-4.4408920985006262e-16)
+2.00000000000000844 (-4.4408920985006262e-16)
+2.00000000000000799 (-4.4408920985006262e-16)
+2.00000000000000755 (-4.4408920985006262e-16)
+2.00000000000000711 (-4.4408920985006262e-16)
+2.00000000000000666 (-4.4408920985006262e-16)
+2.00000000000000622 (-4.4408920985006262e-16)
+2.00000000000000577 (-4.4408920985006262e-16)
+2.00000000000000533 (-4.4408920985006262e-16)
+2.00000000000000488 (-4.4408920985006262e-16)
+2.00000000000000444 (-4.4408920985006262e-16)
+2.00000000000000400 (-4.4408920985006262e-16)
+2.00000000000000355 (-4.4408920985006262e-16)
+2.00000000000000311 (-4.4408920985006262e-16)
+2.00000000000000266 (-4.4408920985006262e-16)
+2.00000000000000222 (-4.4408920985006262e-16)
+2.00000000000000178 (-4.4408920985006262e-16)
+2.00000000000000133 (-4.4408920985006262e-16)
+2.00000000000000089 (-4.4408920985006262e-16)
+2.00000000000000044 (-4.4408920985006262e-16)
+2.00000000000000000 (-4.4408920985006262e-16)
+2.00000000000001021 (+1.021405182655144e-14)
+Repeat
+2.00000000000000977 (-4.4408920985006262e-16)
+2.00000000000000933 (-4.4408920985006262e-16)
+2.00000000000000888 (-4.4408920985006262e-16)
+2.00000000000000844 (-4.4408920985006262e-16)
+2.00000000000000799 (-4.4408920985006262e-16)
+2.00000000000000755 (-4.4408920985006262e-16)
+2.00000000000000711 (-4.4408920985006262e-16)
+2.00000000000000666 (-4.4408920985006262e-16)
+2.00000000000000622 (-4.4408920985006262e-16)
+2.00000000000000577 (-4.4408920985006262e-16)
+2.00000000000000533 (-4.4408920985006262e-16)
diff --git a/ext/random/tests/engines.inc b/ext/random/tests/engines.inc
index 73b070b0c7f..e7b420b1661 100644
--- a/ext/random/tests/engines.inc
+++ b/ext/random/tests/engines.inc
@@ -80,4 +80,27 @@ final class TestXoshiro128PlusPlusEngine implements Engine
     }
 }
 
+final class TestCountingEngine32 implements Engine
+{
+    private int $count = 0;
+
+    public function generate(): string
+    {
+        return pack('V', $this->count++);
+    }
+}
+
+final class TestCountingEngine64 implements Engine
+{
+    private int $count = 0;
+
+    public function generate(): string
+    {
+        if ($this->count > 2147483647 || $this->count < 0) {
+            throw new \Exception('Overflow');
+        }
+        return pack('V', $this->count++) . "\x00\x00\x00\x00";
+    }
+}
+
 ?>