Gamerule missing indicator for affected gamerule
Getting a value of a gamerule
When you get the value of a gamerule by only typing
/gamerule [rule name]
You will only get this feedback:
[rule name] = [value]
However the word gamerule is not mentioned (unlike trying to get the value of an not existing gamerule).
Setting a gamerule
When you set a gamerule there is no indicator which gamerule you actually set nor to which value. The current feedback is just:
Game rule has been updated
This part fixed in 1.9