Awesome, I think a back-end filter would be fine, since trying to describe what’s going on here in a UI option might be difficult for nontechnical users to understand.
For the short term, I’m covered by simply commenting out the stripslashes_deep() call in the ACF code, so it’s not a big rush. Let me know when the filter makes it into core, though! At that point I can roll out a custom filter in all of my relevant themes.
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