Polyfill: Using both dateStyle and timeStyle throws a TypeError

[anba]

new Temporal.PlainDateTime(2024, 12, 11).toLocaleString("en", {dateStyle: "full", timeStyle: "full"})

Throws:

Uncaught TypeError: can't set option hour when dateStyle is used
    getSlotLazy intl.mjs:57
    extractOverrides intl.mjs:595
    format intl.mjs:232
    Call Call.js:19
    boundFormat intl.mjs:169
    toLocaleString plaindatetime.mjs:262
    <anonymous> debugger eval code:1

[ptomato]

Haha, the bot code seems somewhat plausible but will unfortunately regress #2795. So a different solution is needed. I assume this was missed because there's a test262 coverage gap, so we should have test262 coverage for this case as well.

(Edit: My comment no longer makes sense because the bot comment has been removed. For posterity, I was referring to a comment added by an AI bot that included code attempting to fix the bug.)