Simple in-memory key to object cache with expiry

Features

Dynamic values mean there's no type checking or serialization. This means you can store anything you want in the cache.

Usage

double someValue = getCachedSync(
    id: "some.key", 
    getter: () => 1.5, 
    duration: Duration(minutes: 5));

getCached(
    id: "some.async", 
    getter: () async => 1.5, 
    duration: Duration(minutes: 5))
.then((value) => print(value));