@classmethod<EOL><INDENT>def coerce(cls, key, value):<DEDENT>
if not isinstance(value, MutableDict):<EOL><INDENT>if isinstance(value, dict):<EOL><INDENT>return MutableDict(value)<EOL><DEDENT>return Mutable.coerce(key, value)<EOL><DEDENT>else:<EOL><INDENT>return value<EOL><DEDENT>
Convert plain dictionaries to MutableDict.