[Zope] restrictedTraverse([''])

I happened to find that obj.restrictedTraverse(['']) returns the application object, instead of the object itself. This is quite unexpected, as both obj.restrictedTraverse('') and obj.restrictedTraverse([]) returns the object itself. Is this a bug or a feature? -- HONG Yuan Homemaster Trading Co., Ltd. No. 601, Bldg. 41, 288 Shuangyang Rd. (N) Shanghai 200433, P.R.C. Tel: +86 21 55056553 Fax: +86 21 55067325 E-mail: hongyuan@homemaster.cn