Numerical question answer and tolerance round last digit, each time I save the values until entire number is gone

Test: Calculated questions

1. Log in as admin and go to Site home
2. From the cog icon, go to More... > Question bank > Questions
3. Create a calculated question with the following:
   • Answer 1 formula: {x}*2
   • Grade: 100%
   • Answer display: 9 decimals
4. Accept the defaults on the "choose wildcard dataset properties" page and click on the "Next page" button
5. At the "Item to add" section, enter the following
   • Wild card {x}: 0.000001231
   • Minimum: 0.00000123
   • Maximum: 0.00000124
   • Decimal places: 9
6. Click on the "Update the datasets parameters" button at the top of the page
7. At the bottom of the page, set the "Add items" field to10 and click on the "Add" button
8. set the display field to "10" and then click on the "Display" button
9. Take a note of the "Wild card {x}" value for "Set 9".
   • Important: if the number of decimals for this value is less than 9, then take the value for "set 8". If the numbers of decimals for value in "set 8" is again less than 9 decimals, then take the value in "set 7", etc
10. Click on the "Save changes" button to finalise the creation of question
11. Edit the question you created again.
12. Click on the "Save changes" button without changing anything on the form
13. Click on the "Next page" button
14. When the next page is loaded, view the page source (it is safe to reload the page if needed)
15. Verify that the value of "number[9]" hidden input field is what you recorded at step 9. They should have equal numeric values. It is ok if one of them is in scientific notation.
    • Important: if at step 9, you had to take the value for "set 8", then here check the value of "number[8]". If "set 7 then "number[7]", etc.