Convert thread pool sizes to integers

lib/puma/thread_pool.rb

@@ -20,8 +20,8 @@ module Puma
       @spawned = 0
       @waiting = 0
 
-      @min = min
-      @max = max
+      @min = Integer(min)
+      @max = Integer(max)
       @block = block
       @extra = extra
 
@@ -34,7 +34,7 @@ module Puma
       @auto_trim = nil
 
       @mutex.synchronize do
-        min.times { spawn_thread }
+        @min.times { spawn_thread }
       end
     end
 

test/test_thread_pool.rb

@@ -32,6 +32,16 @@ class TestThreadPool < Test::Unit::TestCase
     assert_equal 1, pool.spawned
   end
 
+  def test_converts_pool_sizes
+    pool = new_pool('0', '1')
+
+    assert_equal 0, pool.spawned
+
+    pool << 1
+
+    assert_equal 1, pool.spawned
+  end
+
   def test_append_queues_on_max
     finish = false
     pool = new_pool(0, 1) { Thread.pass until finish }