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Allow parsing aliases under Ruby 3 / Psych 4+#1
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…ctivesupport for Hash#deep_merge to get specs to pass.
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Psych 4+ (and by extension, Ruby's YAML module) uses
safe_loadby default. This method is more restrictive in what it will parse from a YAML file. Notably, it does not allow for aliases by default. We use aliases fairly frequently in our application settings files, so we want to enable that option when loading.