dblock / hashie / 39886126695

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Make DeepMerge copy containers and retain domain objects

Define a consistent breaking copying policy for receiver and incoming values: recursively copy hashes, arrays, and strings, retain arbitrary leaf objects by identity, and never invoke their dup or deep_dup methods. Preserve conflict-block and bang-method behavior and document the migration for a major release.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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