SQLite: Add @DatabaseCollation - #345
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This macro is similar to `@DatabaseFunction` but can be used to define
custom collating sequences:
```swift
@DatabaseCollation
func unicode(_ lhs: String, _ rhs: String) -> CollationOrder {
CollationOrder(lhs, rhs)
}
db.install(collation: $unicode)
Reminder.order { $0.title.collate($unicode) }
```
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This macro is similar to
@DatabaseFunctionbut can be used to define custom collating sequences: