Country Flags Widget

Hi everyone,
Currently I’m using the package country_flags_world: ^2.0.2. Do you think this is the best package for handling country flags?
I’m working on a Flutter project that needs to display country flags.
Some challenges I’ve run into:
How to handle caching so that flags load fast and also work offline
Making sure country codes (ISO alpha-2) are validated correctly
Supporting multiple sizes and making them customizable
Handling errors when the flag image is missing
I tried a few approaches, and even experimented with writing my own widget to handle these cases. It works for now, but I’m not sure if I’m over-engineering it.
So my questions are:
How do you usually handle country flags in Flutter apps?
Is there a simpler or more efficient way to approach this problem?
What features do you consider “must-have” for a flags widget?
Thanks in advance for sharing your experiences!