dblock / hashie / 39886169950

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Preserve incoming DeepMerge hash subclasses by default

Use source.dup.clear for new nested hash destinations, preserving constructor-required classes, defaults, and instance state without changing existing destination types or value copying. Keep the factory override as a migration path to plain Hash destinations and document the breaking major-release behavior.

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

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