Draw game with x.5 komi?

[Arseny Krasutsky]

I wonder why the results of rating games like these are counted as draws although komi isn't an integer?

https://katagotraining.org/sgfplayer/rating-games/1046078/
https://katagotraining.org/sgfplayer/rating-games/1047513/
https://katagotraining.org/sgfplayer/rating-games/1046622/

[OmnipotentEntity]

They are button games.

Button: Whether a half-point is awarded to the first player to be able to pass. (e.g. slightly rewarding endgame efficiency, partially reconciling area and territory scoring).

[Arseny Krasutsky]

I've never heard about such rule, thank you for the explanation.