qtype_match cannot distinguish answer '0' and '0.0'

Question bank

1. Create a new course.
2. Go to the question bank and start creating a Matching question
3. Put in any name and question text.
4. Under the "Answers" section:

   Sub-question #	Question	Answer
   1	System.out.println(0);	0
   2	System.out.println(0.0);	0.0
   3	System.out.println(2);	2
   4	System.out.println(2.0);	2.0

5. Save the question and Preview it.
6. Verify that all four answers are shown in the dropdown menus.
7. Fill in the correct answers.
8. Verify that you get full marks.
9. Press "Start again"
10. For the questions with ".0" at the end, select the answers without the ".0" (e.g. match "System.out.println(0.0);" with "0")
11. Confirm that those answers are marked wrong.

Backup and restore

1. Backup the course, and restore the backup to a new course.
2. Go to the new course's question bank.
3. Preview the matching question.
4. Verify that all four answers are shown in the dropdown menus.
5. Fill in the correct answers.
6. Verify that you get full marks.
7. Press "Start again"
8. For the questions with ".0" at the end, select the answers without the ".0" (e.g. match "System.out.println(0.0);" with "0")
9. Confirm that those answers are marked wrong.