Fix possible infinite loops in ostream operator #106
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Avoids running into possible infinite loops with cyclical references
This was referenced Jun 24, 2020
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The current approach simply refrains from printing the complete object and falls back to the
idin case the referred to class is the same as the class that is printed.This has the advantage, that it removes the possibility of running into infinite loops when cyclical references exist. The disadvantage is that for reference structures, where no such cycles exist the information content is reduced to only the
ids instead of the full objects.Fixes #105