dblock / hashie / 39886721991

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Preserve incoming DeepMerge hash subclasses directly

Replace the protected deep_merge_new_hash hook with direct source.dup.clear when creating incoming nested destinations. Preserve classes, defaults, and instance state without empty constructors; document hook removal and the breaking major-release migration.

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

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