FIX: Validation of min_posts and max_posts didn't work

lib/topic_query.rb

@@ -13,14 +13,14 @@ class TopicQuery
   def self.validators
     @validators ||= begin
 
-      zero_or_more = lambda do |x|
-        Integer === x && x >= 0
-      end
-
       int = lambda do |x|
         Integer === x || (String === x && x.match?(/^-?[0-9]+$/))
       end
 
+      zero_or_more = lambda do |x|
+        int.call(x) && x.to_i >= 0
+      end
+
       array_int_or_int = lambda do |x|
         int.call(x) || (
           Array === x && x.length > 0 && x.all?(&int)

spec/requests/list_controller_spec.rb

@@ -36,6 +36,12 @@ RSpec.describe ListController do
 
       get "/latest.json?exclude_category_ids=-1"
       expect(response.status).to eq(200)
+
+      get "/latest.json?max_posts=12"
+      expect(response.status).to eq(200)
+
+      get "/latest.json?min_posts=0"
+      expect(response.status).to eq(200)
     end
 
     it "doesn't throw an error with page params as an array" do