More standards

src/TrueSkill/Layers/IteratedTeamDifferencesInnerLayer.php

@@ -44,7 +44,7 @@ final class IteratedTeamDifferencesInnerLayer extends TrueSkillFactorGraphLayer
     }
 
     #[\Override]
-    public function createPriorSchedule(): ?ScheduleSequence
+    public function createPriorSchedule(): ScheduleSequence
     {
         switch (count($this->getInputVariablesGroups())) {
             case 0:

src/TrueSkill/Layers/PlayerPerformancesToTeamPerformancesLayer.php

@@ -34,7 +34,7 @@ final class PlayerPerformancesToTeamPerformancesLayer extends TrueSkillFactorGra
     }
 
     #[\Override]
-    public function createPriorSchedule(): ?ScheduleSequence
+    public function createPriorSchedule(): ScheduleSequence
     {
         $localFactors = $this->getLocalFactors();
 
@@ -69,7 +69,7 @@ final class PlayerPerformancesToTeamPerformancesLayer extends TrueSkillFactorGra
     }
 
     #[\Override]
-    public function createPosteriorSchedule(): ?ScheduleSequence
+    public function createPosteriorSchedule(): ScheduleSequence
     {
         $allFactors = [];
         $localFactors = $this->getLocalFactors();

src/TrueSkill/Layers/PlayerPriorValuesToSkillsLayer.php

@@ -51,7 +51,7 @@ final class PlayerPriorValuesToSkillsLayer extends TrueSkillFactorGraphLayer
     }
 
     #[\Override]
-    public function createPriorSchedule(): ?ScheduleSequence
+    public function createPriorSchedule(): ScheduleSequence
     {
         $localFactors = $this->getLocalFactors();
 

src/TrueSkill/Layers/PlayerSkillsToPerformancesLayer.php

@@ -53,7 +53,7 @@ final class PlayerSkillsToPerformancesLayer extends TrueSkillFactorGraphLayer
     }
 
     #[\Override]
-    public function createPriorSchedule(): ?ScheduleSequence
+    public function createPriorSchedule(): ScheduleSequence
     {
         $localFactors = $this->getLocalFactors();
 
@@ -68,7 +68,7 @@ final class PlayerSkillsToPerformancesLayer extends TrueSkillFactorGraphLayer
     }
 
     #[\Override]
-    public function createPosteriorSchedule(): ?ScheduleSequence
+    public function createPosteriorSchedule(): ScheduleSequence
     {
         $localFactors = $this->getLocalFactors();
 

src/TrueSkill/TwoTeamTrueSkillCalculator.php

@@ -159,7 +159,7 @@ final class TwoTeamTrueSkillCalculator extends SkillCalculator
         $team2Ratings = $teams[1]->getAllRatings();
         $team2Count = count($team2Ratings);
 
-        $totalPlayers = $team1Count + $team2Count;
+        $totalPlayers = (float)($team1Count + $team2Count);
 
         $betaSquared = BasicMath::square($gameInfo->getBeta());