change to destructive `deep_symbolize_keys` after https://github.com/rails/rails/commit/df24b8790f22384a068fece7042f04ffd2fcb33e which allows to do so. This helps to avoid extra hash object creation, by symbolizing inplace
Merge pull request #10627 from vipulnsward/destructive_symbolize

Change to destructive `deep_symbolize_keys` to avoid a new hash creation.