`IOOverrides` Integration for File IO

[marandaneto]

Description

ueman/sentry-dart-tools@7364dfd

That would allow the File IO tracing for 3rd party libs/SDKs such as https://github.com/hivedb/hive

[marandaneto]

Look at sentry_io_overrides.dart, this integration should be opt-in initially and documented since it will overwrite every single new File with SentryFile.