core/enumerable.rbs in rbs-1.1.1 vs core/enumerable.rbs in rbs-1.2.0

@@ -116,10 +116,10 @@
   # %w[foo bar baz].first(10) #=> ["foo", "bar", "baz"]
   # [].first                  #=> nil
   # [].first(10)              #=> []
   # ```
   def first: () -> Elem?
-           | (Integer n) -> ::Array[Elem]?
+           | (_ToInt n) -> ::Array[Elem]
 
   def grep: (untyped arg0) -> ::Array[Elem]
           | [U] (untyped arg0) { (Elem arg0) -> U } -> ::Array[U]
 
   def grep_v: (untyped arg0) -> ::Array[Integer]