[plt-scheme] open-output-string/bytes internals

Hi -

I'm wondering how `open-output-string` and `open-output-bytes` keep the data
written to the port.  Are the data kept in one single contiguous bytes that
gets resized as more bytes are written to it, or in a list of bytes that
gets concatenated later when calling `get-output-string/bytes`, or perhaps
some other methods?

Thanks,
yc
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