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Ignored check result of typeof a === typeof b
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<!-- Please try to reproduce the issue with `typescript@next`. It may have already been fixed. -->
**TypeScript Version:** 3.2.0-dev.20181025
<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
**Search Terms:**
**Code**
```ts
type argType = string | number | boolean;
function sort(a: argType, b: argType): number {
if (typeof a !== typeof b) {
return 0;
}
// typeof a should be number now
if (typeof a !== 'number') {
return 0;
}
// typeof b should be number now
return a - b; // Here TS is not sure that b is number
}
```
**Expected behavior:**
We have already checked that `typeof a` is equal `typeof b`. So if typeof `a` is `number`, than and `b` is `number` too.
**Actual behavior:**
error: `The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.`
**Playground Link:** http://www.typescriptlang.org/play/#src=%0D%0Atype%20argType%20%3D%20string%20%7C%20number%20%7C%20boolean%3B%0D%0Afunction%20sort(a%3A%20argType%2C%20b%3A%20argType)%3A%20number%20%7B%0D%0A%20%20%20%20if%20(typeof%20a%20!%3D%3D%20typeof%20b)%20%7B%0D%0A%20%20%20%20%20%20%20%20return%200%3B%0D%0A%20%20%20%20%7D%0D%0A%0D%0A%20%20%20%20if%20(typeof%20a%20!%3D%3D%20'number')%20%7B%0D%0A%20%20%20%20%20%20%20%20return%200%3B%0D%0A%20%20%20%20%7D%0D%0A%0D%0A%20%20%20%20return%20a%20-%20b%3B%0D%0A%7D
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