IcingaObject: Support numeric properties

Similar to intervalProperties

library/Director/IcingaConfig/IcingaConfigHelper.php

@@ -78,7 +78,7 @@ class IcingaConfigHelper
         return (string) $value;
     }
 
-    protected static function renderFloat($value)
+    public static function renderFloat($value)
     {
         // Render .0000 floats as integers, mainly because of some JSON
         // implementations:

library/Director/Objects/IcingaObject.php

@@ -106,6 +106,16 @@ abstract class IcingaObject extends DbObject implements IcingaConfigRenderer
      */
     protected $intervalProperties = array();
 
+    /**
+     * Array of numeric property names
+     *
+     * Those values will be put out as raw numbers to Icinga 2's config.
+     * Array expects (propertyName => renderedKey)
+     *
+     * @var array
+     */
+    protected $numericProperties = array();
+
     /** @var  Db */
     protected $connection;
 
@@ -141,6 +151,11 @@ abstract class IcingaObject extends DbObject implements IcingaConfigRenderer
         return array_key_exists($property, $this->booleans);
     }
 
+    public function propertyIsNumeric($property)
+    {
+        return array_key_exists($property, $this->numericProperties);
+    }
+
     public function propertyIsInterval($property)
     {
         return array_key_exists($property, $this->intervalProperties);
@@ -1822,6 +1837,13 @@ abstract class IcingaObject extends DbObject implements IcingaConfigRenderer
             );
         }
 
+        if ($this->propertyIsNumeric($key)) {
+            return c::renderKeyValue(
+                $this->numericProperties[$key],
+                c::renderFloat($value)
+            );
+        }
+
         if (substr($key, -3) === '_id'
              && $this->hasRelation($relKey = substr($key, 0, -3))
         ) {