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Type narrowing with assertions containing truthy literals
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**TypeScript Version:** 4.2.0-dev.20201109
<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
**Search Terms:**
`type narrowing truthy`
`type narrowing assertion`
`conditional throw`
**Code**
```ts
function test(foo?: number) {
if (!foo) throw new Error();
return foo.toFixed();
}
function testWithLiteralTrue(foo?: number) {
if (!foo && true) throw new Error();
return foo.toFixed();
}
function testWithTruthyLiteral(foo?: number) {
if (!foo && "str") throw new Error();
return foo.toFixed(); // Object is possibly 'undefined'.
}
```
**Expected behavior:**
In all three functions typescript would know `foo` is a number after the assertion.
**Actual behavior:**
In the last example, `testWithTruthyLiteral`, typescript complains `foo` may be `undefined`. This is the same behavior for all known truthy values except for literal `true`.
**Playground Link:** <!-- A link to a TypeScript Playground "Share" link which demonstrates this behavior -->
https://www.typescriptlang.org/play?ts=4.2.0-dev.20201109#code/GYVwdgxgLglg9mABFApgZygRgBTDnAfgC5EwQBbAIxQCcBKRAbwChFEZhFsBCPOBqAAsacAO6kU4gKI0RNbHQDczVohoooIGkj4A6KHABiMAB4oAJguUBfFaEiwEydFABMufMVIVq9Jqo4uXnxEADJQ5BoQFAFhMQlpWTh5JRU2dU1tRD…
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