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types.optional revision (#120)

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docs/types-library-optional.md
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@ -16,4 +16,4 @@ end
## Design
As a solution, a new method to the `types` library should be added called `optional`. This new method will act the same as `types.unionof(type, types.singleton(nil))`.
As a solution, a new method to the `types` library should be added called `optional`. When called on a union, this will add `nil` to the components. Otherwise, this new method will act the same as `types.unionof(type, types.singleton(nil))`.