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Feature #14371

Updated by naruse (Yui NARUSE) over 2 years ago

Hash#transform_keys! is available when we want to symbolize hash keys. 
 But in some/many cases (for example, receiver hash object is nested configuration tree loaded from any files), hash object are 
 nested object, which has hashes or arrays of hashes as values. 
 It's super useful if we can transform keys of such nested values. 

 My proposal is `Hash#transform_keys!(recursive: true, &:to_sym)`. Pseudo code is: 

 
 ```ruby 
 def transform_keys!(recursive: false, &block) 
   # do original transform_keys! here 
   values.each do |v| 
     if v.respond_to?(:each) 
       v.each{|i| i.transform_keys!(recursive: true, &block) if i.respond_to?(:transform_keys!) } 
     else v.respond_to?(:transform_keys!) 
       v.transform_keys!(recursive: true, &block) 
     end 
   end if recursive 
 end 
 ``` 

 The most major usage example is: `config = MyAwesomeFormat.load(file); config.transform_keys!(recursive: true, &:to_sym)`. 

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