Advance RFC #0848 `"Deprecate array prototype extensions"` to Stage Recommended #1227

Job	Run time
Does PR add RFCs?	10s
Stage must be 'Exploring' (via label) for new RFC before merging	0s
Frontmatter stage must be 'accepted' before merging	0s
Only one RFC can be added in a PR	0s
Verify Accepted PR URL is correct	0s
Filename matches RFC number	0s
RFC must be in only one stage before merging (labels)	0s
	10s

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