If you use the CupertinoIcons package in your Flutter app, you'll definitely want to look at these changes with the new 1.0.0 version of the package:
The existing cupertino_icons 0.1.3 icons are based on iOS 11 aesthetics with sharp angles and thin lines.
As Apple’s iconography updates with new OS versions, the cupertino_icons package is now refreshed as well.
Generally, all old glyphs referenced via the CupertinoIcons API are automatically mapped to very similar looking icons in the new SF Symbols style (rounder, thicker lines).
Some icons that entirely have no equivalents in the new SF Symbols style are left as is.
Some icons that have less variations (such as thickness, alterative looks, etc) are automapped and collapsed to the best matching variation in the new SF Symbols style but should be double checked for whether they still preserve the intended visual effect.