Template containing NULL character fails to evaluate

Templates with NULL Unicode character(s) fail to evaluate

Example code:

```typescript
import Handlebars from "https://esm.sh/handlebars";

const handlebars = Handlebars.create();
const template = handlebars.compile('Hello \x00 {{name}}')
try {
const test = template({name: "foo"})
console.log(test)
} catch (e) {
console.log(e.message)
}
```

Fails with:

```
"Lexical error on line 1. Unrecognized text.
Hello {{name}}
------^"
```

Codepen: https://codepen.io/Milan-Konir/pen/KwPXgbo?editors=1111

Start by running the Handlebars.create() and handlebars.compile() reproduction with the embedded NULL character. Trace the compile path from handlebars.compile into the template evaluation and identify where the NULL is rejected; done means the example evaluates without the lexical error.

Written by the indexing model from the issue text.