Advance RFC #0848 `"Deprecate array prototype extensions"` to Stage Released #1192

Job	Run time
Does PR add RFCs?	5s
Stage must be 'Exploring' (via label) for new RFC before merging	0s
RFC must be in only one stage before merging (labels)	0s
Only one RFC can be added in a PR	0s
Frontmatter stage must be 'accepted' before merging	0s
Verify Accepted PR URL is correct	0s
Filename matches RFC number	0s
	5s

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