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unknown types should not able to concat with strings
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<!-- Please try to reproduce the issue with `typescript@next`. It may have already been fixed. -->
**TypeScript Version:** 3.3.0
**Code**
```ts
declare const a: unknown;
const b = a + 123;
const c = a + '123';
const d = `${a}123`;
```
**Expected behavior:**
All the declarations of variables `b` `c` `d` should have errors.
**Actual behavior:**
Only declaration of variable `b` have error.
**Playground Link:** <!-- A link to a TypeScript Playground "Share" link which demonstrates this behavior -->
https://www.typescriptlang.org/play/index.html#src=declare%20const%20a%3A%20unknown%3B%0Aconst%20b%20%3D%20a%20%2B%20123%3B%0Aconst%20c%20%3D%20a%20%2B%20'123'%3B%0Aconst%20d%20%3D%20%60%24%7Ba%7D123%60%3B%0A
Although we won't get runtime errors in this case, it may cause unpredictable result, e.g. "[[Object]]123", which is unexpected, so I think ts should not allow unknown types to concat with strings.
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