Update TypeSpecifier.php

Author: staabm

src/Analyser/TypeSpecifier.php

@@ -1204,6 +1204,7 @@ private function specifyTypesForCountFuncCall(
 
 					$zero = new ConstantIntegerType(0);
 					foreach ($builderData as [$offsetType, $valueType]) {
+						// non-empty-list already implies the offset 0
 						if ($zero->isSuperTypeOf($offsetType)->yes()) {
 							continue;
 						}