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Document throwing Row.get()

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`@@ -757,6 +757,18 @@ for user in try db.prepare(users) {`
`757`	`757`	promise to the compiler that they’ll never be `NULL`), while `Expression<T?>`
`758`	`758`	`values remain wrapped.`
`759`	`759`
	`760`	+⚠ Column subscripts on `Row` will force try and abort execution in error cases
	`761`	+If you want to handle this yourself, use `Row.get(_ column: Expression<V>)`:
	`762`	`+`
	`763`	+```swift
	`764`	`+for user in try db.prepare(users) {`
	`765`	`+ do {`
	`766`	`+ print("name: \(try user.get(name))")`
	`767`	`+ } catch {`
	`768`	`+ // handle`
	`769`	`+ }`
	`770`	`+}`
	`771`	+```
`760`	`772`
`761`	`773`	`### Plucking Rows`
`762`	`774`

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