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NaN incorrectly narrows to 0
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**TypeScript Version:** 3.9.0-dev.20200222
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**Search Terms:** NaN Truthiness Falsy
**Code**
```ts
function bool(): boolean { return false; }
function number(): number { return NaN; }
let a = number();
let b = bool();
const x = a && b; // type = boolean | 0
console.log(x); // prints NaN (which is neither boolean, nor 0)
```
**Expected behavior:**
Type of `x` should be `number | boolean`.
Since `NaN` isn't a "unit type" like `0`, we can't express `NaN` without using `number`.
**Actual behavior:**
Type of `x` is `0 | boolean`.
**Playground Link:** [playground link](http://www.typescriptlang.org/play/?ts=3.9.0-dev.20200222&ssl=1&ssc=1&pln=8&pc=30#code/GYVwdgxgLglg9mABAIznANgCgJQC4VroCmAhkgN6IBORUIVSwJ6AzkQNyIC+AUKJLASIwIALbIiVHPhHjJiSjToNEAORKrOvHsSiISiALzCxEqdnY7aKIwQw5LPCAhZ6AHrYMAyLyk4B6f0QoAE8AByJbVAxSJAAfRAAGJxcYgDp0OABzTDcLREDEMKoYMCgWNQ0gA)
**Related Issues:** <!-- Did you find other bugs that looked similar? -->
https://github.com/microsoft/TypeScript/issues/32778 (Incorrectly marked as duplicate?)
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