Much stricter coding standards for phpstan, phpstan and psalm.

src/TrueSkill/Layers/IteratedTeamDifferencesInnerLayer.php

@@ -11,7 +11,7 @@ use DNW\Skills\TrueSkill\TrueSkillFactorGraph;
 use Exception;
 
 // The whole purpose of this is to do a loop on the bottom
-class IteratedTeamDifferencesInnerLayer extends TrueSkillFactorGraphLayer
+final class IteratedTeamDifferencesInnerLayer extends TrueSkillFactorGraphLayer
 {
     public function __construct(
         TrueSkillFactorGraph $parentGraph,

src/TrueSkill/Layers/PlayerPerformancesToTeamPerformancesLayer.php

@@ -11,7 +11,7 @@ use DNW\Skills\TrueSkill\Factors\GaussianWeightedSumFactor;
 use DNW\Skills\FactorGraphs\Variable;
 use DNW\Skills\FactorGraphs\KeyedVariable;
 
-class PlayerPerformancesToTeamPerformancesLayer extends TrueSkillFactorGraphLayer
+final class PlayerPerformancesToTeamPerformancesLayer extends TrueSkillFactorGraphLayer
 {
     #[\Override]
     public function buildLayer(): void
@@ -51,7 +51,7 @@ class PlayerPerformancesToTeamPerformancesLayer extends TrueSkillFactorGraphLaye
     /**
      * @param KeyedVariable[] $teamMembers
      */
-    protected function createPlayerToTeamSumFactor(array $teamMembers, Variable $sumVariable): GaussianWeightedSumFactor
+    private function createPlayerToTeamSumFactor(array $teamMembers, Variable $sumVariable): GaussianWeightedSumFactor
     {
         $weights = array_map(
             static function ($v): float {

src/TrueSkill/Layers/PlayerPriorValuesToSkillsLayer.php

@@ -17,7 +17,7 @@ use DNW\Skills\FactorGraphs\ScheduleSequence;
 
 // We intentionally have no Posterior schedule since the only purpose here is to
 // start the process.
-class PlayerPriorValuesToSkillsLayer extends TrueSkillFactorGraphLayer
+final class PlayerPriorValuesToSkillsLayer extends TrueSkillFactorGraphLayer
 {
     /**
      * @param Team[] $teams

src/TrueSkill/Layers/PlayerSkillsToPerformancesLayer.php

@@ -11,7 +11,7 @@ use DNW\Skills\Numerics\BasicMath;
 use DNW\Skills\TrueSkill\Factors\GaussianLikelihoodFactor;
 use DNW\Skills\FactorGraphs\ScheduleSequence;
 
-class PlayerSkillsToPerformancesLayer extends TrueSkillFactorGraphLayer
+final class PlayerSkillsToPerformancesLayer extends TrueSkillFactorGraphLayer
 {
     #[\Override]
     public function buildLayer(): void

src/TrueSkill/Layers/TeamDifferencesComparisonLayer.php

@@ -9,7 +9,7 @@ use DNW\Skills\TrueSkill\Factors\GaussianGreaterThanFactor;
 use DNW\Skills\TrueSkill\Factors\GaussianWithinFactor;
 use DNW\Skills\TrueSkill\TrueSkillFactorGraph;
 
-class TeamDifferencesComparisonLayer extends TrueSkillFactorGraphLayer
+final class TeamDifferencesComparisonLayer extends TrueSkillFactorGraphLayer
 {
     private readonly float $epsilon;
 

src/TrueSkill/Layers/TeamPerformancesToTeamPerformanceDifferencesLayer.php

@@ -7,7 +7,7 @@ namespace DNW\Skills\TrueSkill\Layers;
 use DNW\Skills\FactorGraphs\Variable;
 use DNW\Skills\TrueSkill\Factors\GaussianWeightedSumFactor;
 
-class TeamPerformancesToTeamPerformanceDifferencesLayer extends TrueSkillFactorGraphLayer
+final class TeamPerformancesToTeamPerformanceDifferencesLayer extends TrueSkillFactorGraphLayer
 {
     #[\Override]
     public function buildLayer(): void