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Build object from stream.

Handles the basic case of loading a single object from a stream.

default_class Class that is instantiated upon the detection of a new document. An instance of this class will act as the document itself.
stream String document or open file object to process as per the yaml.parse method. Any object that implements a 'read()' method which returns a string document will work with the YAML parser.
loader_class Used for dependency injection.