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SharpZipLib
#ziplib is a Zip, GZip, Tar and BZip2 library written entirely in C# for the .NET platform.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Not python but I have story of team that depended on a C# library for saving zip files (SharpZipLib); turns out SharpZipLib had an issue: it could corrupt zip files ( https://github.com/icsharpcode/SharpZipLib/issues/391 ). This was a desktop app and reports from users came pouring in about they not being able to open their files. In response the company had to first manually recover their user's data; and nowadays they stress test sharpziplib to make sure it does not produce corrupted files in newer versions.
I think this is the PR that was being talked about: https://github.com/rubygems/rubygems.org/issues/2058