feat: More robust InputStreamWrapper #175
Merged
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A very small PR with 2 QoL changes.
I lost quite some time debugging, because a file due to experiments, a folder was generated that had the name (minus compression extension) of an input file. This was also detected by filesystem::exists. Now we check for actual regular files.
Moreover, a user should also be able to specify compressed files as input, and the InputStreamWrapper should recognise that it already has a .xz or .zst ending, without trying to forcefully append the ending when it wants to read compressed input files.