Document that metis_reader expects a seekable stream #34
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metis_reader unconditionally seeks to the beginning of the stream when it starts, which causes it to fail with a metis_input_exception when reading from streams that are not seekable. For example, in my case I’m trying to read a graph that is piped into my program via stdin, which does not work because of this. This PR adds a note about that to the documentation to prevent surprises.