This method is deprecated or moved on the latest stable version.
The last existing version (v2.3.8) is shown here.
stringify_keys!()
public
Destructively convert all keys to strings.
# File activesupport/lib/active_support/core_ext/hash/keys.rb, line 14
def stringify_keys!
keys.each do |key|
self[key.to_s] = delete(key)
end
self
end