Much stricter coding standards for phpstan, phpstan and psalm.

src/FactorGraphs/FactorList.php

@@ -7,7 +7,7 @@ namespace DNW\Skills\FactorGraphs;
 /**
  * Helper class for computing the factor graph's normalization constant.
  */
-class FactorList
+final class FactorList
 {
     /**
      * @var Factor[] $list
@@ -31,11 +31,11 @@ class FactorList
             $numberOfMessages = $factor->getNumberOfMessages();
 
             for ($j = 0; $j < $numberOfMessages; ++$j) {
-                $sumLogZ += $factor->sendMessageIndex($j);
+                $sumLogZ += (float)$factor->sendMessageIndex($j);
             }
         }
 
-        $sumLogS = 0;
+        $sumLogS = 0.0;
 
         foreach ($list as &$currentFactor) {
             $sumLogS += $currentFactor->getLogNormalization();

src/FactorGraphs/KeyedVariable.php

@@ -4,7 +4,7 @@ declare(strict_types=1);
 
 namespace DNW\Skills\FactorGraphs;
 
-class KeyedVariable extends Variable
+final class KeyedVariable extends Variable
 {
     public function __construct(private readonly mixed $key, mixed $prior)
     {

src/FactorGraphs/Message.php

@@ -6,7 +6,7 @@ namespace DNW\Skills\FactorGraphs;
 
 use DNW\Skills\Numerics\GaussianDistribution;
 
-class Message
+final class Message
 {
     public function __construct(private GaussianDistribution $value)
     {

src/FactorGraphs/ScheduleLoop.php

@@ -4,7 +4,7 @@ declare(strict_types=1);
 
 namespace DNW\Skills\FactorGraphs;
 
-class ScheduleLoop extends Schedule
+final class ScheduleLoop extends Schedule
 {
     public function __construct(private readonly Schedule $scheduleToLoop, private readonly float $maxDelta)
     {

src/FactorGraphs/ScheduleSequence.php

@@ -4,7 +4,7 @@ declare(strict_types=1);
 
 namespace DNW\Skills\FactorGraphs;
 
-class ScheduleSequence extends Schedule
+final class ScheduleSequence extends Schedule
 {
     /**
      * @param Schedule[] $schedules

src/FactorGraphs/ScheduleStep.php

@@ -4,7 +4,7 @@ declare(strict_types=1);
 
 namespace DNW\Skills\FactorGraphs;
 
-class ScheduleStep extends Schedule
+final class ScheduleStep extends Schedule
 {
     public function __construct(private readonly Factor $factor, private readonly int $index)
     {

src/FactorGraphs/VariableFactory.php

@@ -4,9 +4,9 @@ declare(strict_types=1);
 
 namespace DNW\Skills\FactorGraphs;
 
-class VariableFactory
+final readonly class VariableFactory
 {
-    public function __construct(private readonly \Closure $varPriorInitializer)
+    public function __construct(private \Closure $varPriorInitializer)
     {
     }