fix ublog rank setting store

modules/memo/src/main/SettingStore.scala

@@ -67,6 +67,7 @@ object SettingStore {
       case _                            => none
     })
     implicit val intReader                          = new StringReader[Int](_.toIntOption)
+    implicit val floatReader                        = new StringReader[Float](_.toFloatOption)
     implicit val stringReader                       = new StringReader[String](some)
     def fromIso[A](iso: lila.common.Iso[String, A]) = new StringReader[A](v => iso.from(v).some)
   }

modules/ublog/src/main/Env.scala

@@ -31,7 +31,7 @@ final class Env(
 
   val rankFactorSetting = settingStore[Float](
     "ublogRankFactor",
-    default = 1d,
+    default = 1f,
     text = "Ublog rank factor".some,
     onSet = _ => rank.recomputeRankOfAllPosts
   ).taggedWith[UblogRankFactor]