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leanprover / lean4 Public

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chore: rename Array.flatten to join, and upstream lemmas #5069

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chore: rename Array.flatten to join, and upstream lemmas

chore: rename Array.flatten to join, and upstream lemmas #5069

Summary
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- check-lean-files
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- Usage
- Workflow file

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Job	Run time
check-lean-files	14s
	14s

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