revert change for issue comment testing

lib/mock_redis/set_methods.rb

@@ -119,14 +119,13 @@ def srandmember(key, count = nil)
     end
 
     def srem(key, members)
+      members = Array(members).map(&:to_s)
+
       with_set_at(key) do |s|
-        if members.is_a?(Array)
-          orig_size = s.size
-          members = members.map(&:to_s)
-          s.delete_if { |m| members.include?(m) }
-          orig_size - s.size
+        if members.size > 1 || redis_gem_v5?
+          size_after(s) { s.delete_if { |m| members.include?(m) } }
         else
-          s.delete?(members.to_s) ? 1 : 0
+          !!s.delete?(members.first)
         end
       end
     end