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There are a bunch of reasons to do this: 1. This is the oldest version of macOS that people still use - Released 5½ years ago, went out of security support 2½ years ago - 93.5% according to https://www.statista.com/statistics/944559/worldwide-macos-version-market-share/ - 96.8% according to https://gs.statcounter.com/os-version-market-share/macos/desktop/worldwide 2. GLib uses `utimensat` added in 10.13 for nanosecond granularity file timestamps, which is an important feature 3. This is also the oldest version supported by Qt5 Part-of: <!1115>
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