[Zope] manage_changeProperties has strange side effect on response Content-Type.

[Gaute Amundsen]

This gave me such a headache today, that I thought I ought to mention it.

All my pages normally have a content-type of ISO-8859-1
I have not spent much thought on this, it has just worked nicely like that.

Today I had a page that called a python script, that even when I made it 
return an empty string, changed the content-type of my page to utf-8.

I finally tracked it down to this difference:

item.manage_changeProperties({'title':'Hustype'}) 	gives utf-8.
item.manage_changeProperties(title='Hustype')		leaves ISO-8859-1 intact.

WTF is that? 

Now you have been warned :)

Regards

Gaute Amundsen