Ideas for a RFC 6532 API
Policy
- - the internal charset has to be changeable (or at least a USASCII/UTF8 switch is needed)
 
Header
_header_value_parser
- - use settings from policy in _fold
 
Steps
- change the Header class in header.py to make the default charset changeable (add '_internal_charset' property)
 NOT SURE ABOUT THIS: create new classes in the headerregistry.py (e.g. UnicodeAddressHeader as inheritor of AddressHeader
- provide an alternative header map (e.g. _unicode_header_map) using the new classes
 HeaderRegistry: create an inherited class with the _unicode_header_map as default.
...
- create a policy making use of the above
 
