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Instances of univ.OctetString class emulate an immutable sequence protocol object by means of the following additional methods:
Returns object slice as a OctetString object instance by index (integer or slice type).
Returns object value length of OctetString object (as integer).
Returns concatenated OctetString and value (operands reflected for __r*__ version).
Returns an OctetString instance with payload repeted value times.