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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 _SafeDecodeBytes(unused_field, value):
 """Decode the urlsafe base64 value into bytes."""

    try:
        result = base64.urlsafe_b64decode(str(value))
        complete = True
    except TypeError:
        result = value
        complete = False
    return CodecResult(value=result, complete=complete)