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fix: update buffer when accessing a `FileStream` in parallel (#625) #465

Job	Run time
Stryker mutation testing (Ubuntu)	25m 0s
Test (MacOS)	6m 26s
Test (Examples)	3m 11s
Stryker mutation testing (Windows)	14m 20s
Test (.NET Framework)	5m 5s
Test (Ubuntu)	6m 18s
Test (Windows)	11m 40s
Upload coverage to Codacy	17s
Deploy	0s
Cleanup	0s
	1h 12m 17s

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