Merge pull request #16542 from seamusabshere/numerify-pool-checkout-timeout-from-urls-4-1-stable

Make sure :checkout_timeout and :dead_connection_timeout are numbers
Conflicts:
	activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb

activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb

@@ -234,7 +234,7 @@ def initialize(spec)
 
         @spec = spec
 
-        @checkout_timeout = spec.config[:checkout_timeout] || 5
+        @checkout_timeout = (spec.config[:checkout_timeout] && spec.config[:checkout_timeout].to_f) || 5
         @reaper  = Reaper.new self, spec.config[:reaping_frequency]
         @reaper.run