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Explanation: An ❰Optional❱ element must have a type matching the type annotation
For example, this is a valid ❰Optional❱ value:
┌────────────────────────┐
│ [1] : Optional Integer │ ❰1❱ is an ❰Integer❱, which matches the type
└────────────────────────┘
... but this is $_NOT a valid ❰Optional❱ value:
┌────────────────────────────┐
│ ["ABC"] : Optional Integer │ ❰"ABC"❱ is not an ❰Integer❱
└────────────────────────────┘
Your ❰Optional❱ element should have this type:
↳ $txt0
... but the element you provided:
↳ $txt1
... has this type instead:
↳ $txt2
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