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SQLite3 shell doing math operation on parameter substitution
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This behaviour has been reported [previously](https://sqlite.org/forum/forumpost/1ed51ec0d0c71a42).

A workaround to preserve the value is to place it in parentheses. e.g.

```bash
sqlite> .param set @contact ('+66-2-615-3964')
sqlite> SELECT @contact;
+66-2-615-3964
```

Probably just requires some clarification in the docs.