Docs: what is preserved on keyword replacement writes (match types, bids, labels)?

If full-set replacement stays the only route for keyword edits, integrators need to know exactly what happens to criteria that are re-sent unchanged. Are they matched and left alone, or removed and recreated? Specifically:
keyword-level bid overrides, match type when the entry is sent as a bare string versus { text, matchType }, labels, and the criterion's own history (quality score, statistics).

Recreating a keyword resets its history in Google Ads, which would quietly damage an account that our tool "helped". A short paragraph in the update-ad reference would settle it.

Also worth correcting while you're there: the guide page for high-demand periods reads as read-only, while the API reference documents POST createHighDemandPeriod. Your team confirmed the reference is current — the guide had us plan
around a limitation that doesn't exist.