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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def write_to_buffer(self, buf):
 """Save the context to a buffer."""

        doc = self.to_dict()

        if config.rxt_as_yaml:
            content = dump_yaml(doc)
        else:
            content = json.dumps(doc, indent=4, separators=(",", ": "))

        buf.write(content)