How do I display half stars?

i did not find half star option but i save average voting result link 3.5 or 4.5. The average is generating according to number of voting one same node.

The other option may be "Number of stars" 10 instead 5.

But i am also looking for half star feature.

The same here.

We can add configuration field formatter to add - disabled roundoff.. which by default set to FALSE
But if we want to have half star, then set disabled roundoff to TRUE
so we are able to get appropriate data and by using minimum css able to get half star at appropriate place.

Reviewed the Code in PR, it looks good as a start, Moving this to needs review for manual testing.

Steps to test:
* Add fivestar rating field on content
* Set the Disabled roundoff of the rating value to TRUE
* user should add content rating
* Check the rating values on content - if it has decimal value.. this should display half star rating value

"Needs tests" means automated tests, not manual testing.