[luatex] Chunks of pdfe.readfromstream()

[Andreas Matthias]

The manual says that

   str, n = pdfe.readfromstream(<stream>)

reads the stream in chunks. Now I had expected that `str` is just one chunk
of the whole stream.
But it seems that `str` always contains the whole stream.

Could someone enlighten me what "read in chunks" means?

Cheers
Andreas
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