MDL-81458 question: Cast the fraction value to a float

When retrieving the answer data from the database, it's essential to
cast the value of the answer's fraction to a float before storing it
into the question object. This step is crucial for ensuring consistency,
as some database engines return floats as strings like '1.0000000'.

question/type/questiontypebase.php

@@ -931,23 +931,29 @@ public function get_question_options($question) {
         if (is_array($extraanswerfields)) {
             $answerextensiontable = array_shift($extraanswerfields);
             // Use LEFT JOIN in case not every answer has extra data.
-            $question->options->answers = $DB->get_records_sql("
+            $answers = $DB->get_records_sql("
                     SELECT qa.*, qax." . implode(', qax.', $extraanswerfields) . '
                     FROM {question_answers} qa ' . "
                     LEFT JOIN {{$answerextensiontable}} qax ON qa.id = qax.answerid
                     WHERE qa.question = ?
                     ORDER BY qa.id", array($question->id));
-            if (!$question->options->answers) {
+            if (!$answers) {
                 echo $OUTPUT->notification('Failed to load question answers from the table ' .
                         $answerextensiontable . 'for questionid ' . $question->id);
                 return false;
             }
         } else {
             // Don't check for success or failure because some question types do
             // not use the answers table.
-            $question->options->answers = $DB->get_records('question_answers',
+            $answers = $DB->get_records('question_answers',
                     array('question' => $question->id), 'id ASC');
         }
+        // Store the answers into the question object.
+        $question->options->answers = array_map(function($answer) {
+            // Some database engines return floats as strings like '1.0000000'. Cast to float for consistency.
+            $answer->fraction = (float) $answer->fraction;
+            return $answer;
+        }, $answers);
 
         $question->hints = $DB->get_records('question_hints',
                 array('questionid' => $question->id), 'id ASC');