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DynamicBuffer_v1: Move bytes from the output sequence to the input sequence.
void commit( std::size_t n);
The number of bytes to append from the start of the output sequence to the end of the input sequence. The remainder of the output sequence is discarded.
          Requires a preceding call prepare(x)
          where x >=
          n, and no intervening operations
          that modify the input or output sequence.
        
          If n is greater than the
          size of the output sequence, the entire output sequence is moved to the
          input sequence and no error is issued.