Why Ice::createOutputStream not use byte sequence parameter?

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createInputStream(const CommunicatorPtr&, const ::std::vector< Byte >&);
createOutputStream(const CommunicatorPtr&);
"createInputStream" use byte sequence paraeter, why createOutputStream not use ?
createOutputStream(const CommunicatorPtr&);
"createInputStream" use byte sequence paraeter, why createOutputStream not use ?
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I have wait a week!