`eval` with arrow function produces "TypeError: result is not a function"

[linkej-autodesk]

Repro:

playwright-cli eval "[1,2,3].map(x => x*2)"

### Error
Error: page._evaluateFunction: TypeError: result is not a function
    at UtilityScript.evaluate (<anonymous>:303:16)
    at UtilityScript.<anonymous> (<anonymous>:1:44)

Workaround: run-code "async page => await page.evaluate(() => {...})"

We need to use eval/page.evaluate a lot since we're mostly interaction with an API and not the DOM. I observed agents often trying eval, which didn't work for multiple expressions. I thought maybe that's just a limitation of the eval, and instructed the agent to use eval only for single expressions, which it did, but failed again as described above. At that point I thought it's kinda unreasonably limited :)