[playground] Infinity is reported as null

Consider the following program:

```
ask {
const factorial: int(int) = fun(n:int):int {
if (n < 2) {
return n
}

n * factorial(n - 1)
}

200:factorial
}
```

In CLI the result is:
```
float ask(const('factorial',fun(let('n',get('$0')),if(call(get('<'),get('n'),2),block(return(get('n'))),block()),call(get('*'),get('n'),call(get('factorial'),call(get('-'),get('n'),1))))),call(get('factorial'),200))
Infinity
🦄
```

However, [Playground](https://cli.askql.org/) displays:
```
null
```

Reproduce the factorial program in the CLI and at https://cli.askql.org/, then compare how the Playground receives and renders the result. Trace the Playground's result-handling entry point and verify that the completed behavior displays Infinity rather than null for this program.

Written by the indexing model from the issue text.