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update README with instructions on sum types #482

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update README with instructions on sum types #482

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9 changes: 9 additions & 0 deletions docsite/source/basics/macros.html.md
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Expand Up @@ -19,6 +19,15 @@ Dry::Schema.Params do
end
```

Predicates passed as an array will be `OR`-ed automatically:

```ruby
Dry::Schema.Params do
# expands to `required(:id) { str? | int? }`
required(:id).value([:string, :integer])
end
```

### filled

Use it when a value is expected to be filled. "filled" means that the value is non-nil and, in the case of a `String`, `Hash`, or `Array` value, that the value is not `.empty?`.
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