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Index: sapphire/core/Object.php
===================================================================
--- sapphire/core/Object.php	(revision 98430)
+++ sapphire/core/Object.php	(working copy)
@@ -538,11 +538,7 @@
 			
 			if($extensions = self::uninherited_static($class, 'extensions')) {
 				foreach($extensions as $extension) {
-					// an $extension value can contain parameters as a string,
-					// e.g. "Versioned('Stage','Live')"
-					if(strpos($extension,'(') === false) $instance = new $extension();
-					else $instance = eval("return new $extension;");
-				
+					$instance = self::extension_inst($extension);
 					$instance->setOwner(null, $class);
 					$this->extension_instances[$instance->class] = $instance;
 				}
@@ -555,6 +551,41 @@
 		}
 	}
 	
+	private static $_cache_inst_args = array();
+	static function extension_inst($extension) {
+		if(!isset(self::$_cache_inst_args[$extension])) {
+			// an $extension value can contain parameters as a string,
+			// e.g. "Versioned('Stage','Live')"
+			if(strpos($extension,'(') === false) {
+				self::$_cache_inst_args[$extension] = new $extension();
+								
+			} else {
+				// Break down into class and args
+				preg_match('/([^(]+)\((.*)\)/', $extension, $matches);
+				$class = $matches[1];
+
+				// This is simplistic - allows for args containing commas
+				$args = explode(',', $matches[2]);
+				foreach($args as $i => $arg) {
+					$arg = ltrim($arg);
+					$lookahead=1;
+					while(($arg[0] == "'" && substr_count($arg, "'")==1)
+							|| ($arg[0] == '"' && substr_count($arg, '"')==1)) {
+						$args[$i] .= ',' . $args[$i+$lookahead];
+						unset($args[$i+$lookahead]);
+						$lookahead++;
+					}
+					$args[$i] = preg_replace('/(^["\'])|(["\']$)/','',trim($args[$i]));
+				}
+
+				$reflector = new ReflectionClass($class);
+				self::$_cache_inst_args[$extension] = $reflector->newInstanceArgs($args);
+			}
+		}
+		
+		return clone self::$_cache_inst_args[$extension];
+	}
+	
 	
 	/**
 	 * Attemps to locate and call a method dynamically added to a class at runtime if a default cannot be located