More type work

src/TrueSkill/Factors/GaussianLikelihoodFactor.php

@@ -15,9 +15,9 @@ use Exception;
  */
 class GaussianLikelihoodFactor extends GaussianFactor
 {
-    private $precision;
+    private float $precision;
 
-    public function __construct($betaSquared, Variable $variable1, Variable $variable2)
+    public function __construct(float $betaSquared, Variable $variable1, Variable $variable2)
     {
         parent::__construct(sprintf('Likelihood of %s going to %s', $variable2, $variable1));
         $this->precision = 1.0 / $betaSquared;
@@ -42,7 +42,7 @@ class GaussianLikelihoodFactor extends GaussianFactor
         );
     }
 
-    private function updateHelper(Message $message1, Message $message2, Variable $variable1, Variable $variable2)
+    private function updateHelper(Message $message1, Message $message2, Variable $variable1, Variable $variable2): float
     {
         $message1Value = clone $message1->getValue();
         $message2Value = clone $message2->getValue();
@@ -70,7 +70,7 @@ class GaussianLikelihoodFactor extends GaussianFactor
         return GaussianDistribution::subtract($newMarginal, $marginal1);
     }
 
-    public function updateMessageIndex($messageIndex)
+    public function updateMessageIndex($messageIndex): float
     {
         $messages = $this->getMessages();
         $vars = $this->getVariables();

src/TrueSkill/Factors/GaussianWithinFactor.php

@@ -14,16 +14,16 @@ use DNW\Skills\TrueSkill\TruncatedGaussianCorrectionFunctions;
  */
 class GaussianWithinFactor extends GaussianFactor
 {
-    private $epsilon;
+    private float $epsilon;
 
-    public function __construct($epsilon, Variable $variable)
+    public function __construct(float $epsilon, Variable $variable)
     {
         parent::__construct(sprintf('%s <= %.2f', $variable, $epsilon));
         $this->epsilon = $epsilon;
         $this->createVariableToMessageBinding($variable);
     }
 
-    public function getLogNormalization()
+    public function getLogNormalization(): float
     {
         /**
  * @var Variable[] $variables
@@ -46,7 +46,7 @@ class GaussianWithinFactor extends GaussianFactor
         return -GaussianDistribution::logProductNormalization($messageFromVariable, $message) + log($z);
     }
 
-    protected function updateMessageVariable(Message $message, Variable $variable)
+    protected function updateMessageVariable(Message $message, Variable $variable): float
     {
         $oldMarginal = clone $variable->getValue();
         $oldMessage = clone $message->getValue();

src/TrueSkill/Layers/PlayerPriorValuesToSkillsLayer.php

@@ -4,6 +4,7 @@ namespace DNW\Skills\TrueSkill\Layers;
 
 use DNW\Skills\FactorGraphs\ScheduleStep;
 use DNW\Skills\FactorGraphs\Variable;
+use DNW\Skills\FactorGraphs\KeyedVariable;
 use DNW\Skills\Numerics\BasicMath;
 use DNW\Skills\Rating;
 use DNW\Skills\TrueSkill\Factors\GaussianPriorFactor;
@@ -63,7 +64,7 @@ class PlayerPriorValuesToSkillsLayer extends TrueSkillFactorGraphLayer
         );
     }
 
-    private function createSkillOutputVariable($key)
+    private function createSkillOutputVariable(mixed $key) : KeyedVariable
     {
         $parentFactorGraph = $this->getParentFactorGraph();
         $variableFactory = $parentFactorGraph->getVariableFactory();

src/TrueSkill/Layers/PlayerSkillsToPerformancesLayer.php

@@ -40,7 +40,7 @@ class PlayerSkillsToPerformancesLayer extends TrueSkillFactorGraphLayer
         );
     }
 
-    private function createOutputVariable($key): KeyedVariable
+    private function createOutputVariable(mixed $key): KeyedVariable
     {
         return $this->getParentFactorGraph()->getVariableFactory()->createKeyedVariable($key, $key . "'s performance");
     }

src/TrueSkill/TrueSkillFactorGraph.php

@@ -19,9 +19,12 @@ use DNW\Skills\TrueSkill\Layers\TeamPerformancesToTeamPerformanceDifferencesLaye
 
 class TrueSkillFactorGraph extends FactorGraph
 {
-    private $layers;
+    /**
+     * @var FactorGraphLayer[] $layers
+     */
+    private array $layers;
 
-    private $priorLayer;
+    private PlayerPriorValuesToSkillsLayer $priorLayer;
 
     public function __construct(private readonly GameInfo $gameInfo, array $teams, array $teamRanks)
     {
@@ -43,7 +46,7 @@ class TrueSkillFactorGraph extends FactorGraph
         ];
     }
 
-    public function getGameInfo()
+    public function getGameInfo(): GameInfo
     {
         return $this->gameInfo;
     }

src/TrueSkill/TwoPlayerTrueSkillCalculator.php

@@ -78,7 +78,7 @@ class TwoPlayerTrueSkillCalculator extends SkillCalculator
         return $results;
     }
 
-    private static function calculateNewRating(GameInfo $gameInfo, Rating $selfRating, Rating $opponentRating, $comparison): Rating
+    private static function calculateNewRating(GameInfo $gameInfo, Rating $selfRating, Rating $opponentRating, PairwiseComparison $comparison): Rating
     {
         $drawMargin = DrawMargin::getDrawMarginFromDrawProbability(
             $gameInfo->getDrawProbability(),