Stop stripping trailing zeros from duration in 3.0

Fixes #184

fish_right_prompt.fish

@@ -42,11 +42,15 @@ function __bobthefish_pretty_ms -S -a ms interval -d 'Millisecond formatting for
     end
 
     switch $FISH_VERSION
-        # Fish 2.3 and lower doesn't know about the -s argument to math.
         case 2.0.\* 2.1.\* 2.2.\* 2.3.\*
+            # Fish 2.3 and lower doesn't know about the -s argument to math.
             math "scale=$scale;$ms/$interval_ms" | string replace -r '\\.?0*$' $interval
-        case \*
+        case 2.\*
+            # Fish 2.x always returned a float when given the -s argument.
             math -s$scale "$ms/$interval_ms" | string replace -r '\\.?0*$' $interval
+        case \*
+            math -s$scale "$ms/$interval_ms"
+            echo -ns $interval
     end
 end