class buffered_raw_out_channel :This class adds a buffer to the underlying
?buffer_size:int -> ?pass_through:int -> raw_out_channel ->
buffer_size: The size of the buffer, by default 4096.
pass_through: If the write request has at least this size, and the buffer is currently empty, the buffer will be bypassed. Defaults to
max_int, i.e. it is off.