fantasy-lenses

Lenses can be chained using `andThen()` to access and update deeply nested properties, as shown in the example where `locationLens.andThen(numberLens)` accesses `person.location.number`.

Setters return new copies of the entire data structure without mutating the original, demonstrated by `store.set(1007)` returning a modified copy of the person object.

Partial lenses allow safe access to optional fields using `fold()` to handle missing data, as shown in the filtering example with `configTypeLens` that avoids runtime errors.

The API aligns with Fantasy Land specifications, making it suitable for integration with other functional libraries in JavaScript ecosystems.