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Daniel Chao
fc8fe86e5a
These methods aren't implemented in `Set`, and don't really make sense because `Set` types can't be accessed by index. Note: although this removes methods, this actually isn't a breaking change: 1. Calling `Set.findIndex()` currently throws an error around "cannot invoke abstract method" 2. `List` and `Set` are the only subclasses of `Collection`. The following code isn't breaking at runtime, although static analysis tooling (like our IDE plugins) will now flag this as an error: ```pkl myCollection: Collection idx = myCollection.indexOf(1) ```