core/string.rbs in rbs-1.0.4 vs core/string.rbs in rbs-1.0.5

@@ -89,10 +89,11 @@
   #     "abcdef" <=> "abcdef"    #=> 0
   #     "abcdef" <=> "abcdefg"   #=> -1
   #     "abcdef" <=> "ABCDEF"    #=> 1
   #     "abcdef" <=> 1           #=> nil
   #
-  def <=>: (untyped other) -> Integer?
+  def <=>: (string other) -> Integer
+         | (untyped other) -> Integer?
 
   # Equality---Returns whether `str` == `obj`, similar to Object#==.
   #
   # If `obj` is not an instance of String but responds to `to_str`, then the two
   # strings are compared using `obj.==`.