Hi Juraj,The file streams opened in a memory file system are not polymorphic with the ones in a disk file system :(.Can you open an issue and assing it to me? I'll work soon on making all of them work and yield binary streams.
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Guille Polito
Research Engineer
Centre de Recherche en Informatique, Signal et Automatique de Lille
CRIStAL - UMR 9189
French National Center for Scientific Research - http://www.cnrs.fr
Phone: +33 06 52 70 66 13