`interface{}` values

[leewz]

I tried to decode a MapType which had interface keys and values.

I was able to decode it with these additions.

type.py:

class GoInterface(GoType):
    typeid = INTERFACE
    zero = None  # Seems to work.
    def __init__(self, loader):
        self._loader = loader
    
    def decode(self, buf):
        typename, buf = GoString.decode(buf)
        # A nil value has an empty typename. What does that mean?
        typeid, buf = GoInt.decode(buf)
        segment, buf = self._loader._read_segment(buf)
        zero, segment = GoUint.decode(segment)  #What's this about?
        assert zero == 0, 'illegal delta for singleton: %s' % zero
        value, segment = self._loader.decode_value(typeid, segment)
        assert segment == b'', 'trailing data in segment: %s' % list(segment)
        return value, buf

loader.py:

from .types import (INTERFACE, GoInterface)

class Loader:
    def __init__(self):
        # ...
        interface_type = GoInterface(self)
        self.types[INTERFACE] = interface_type
        # ...

However, I don't know if this code only works for my own case (being new to Go), and I don't know if I made the right choices, such as inheriting from GoType. I am also uncomfortable with discarding the typename information.