Rails core - Nov 2013 - Please, take a look at PR #10848 "Allow to pass a block to `cattr_reader`."

Allow to pass a block to  cattr_reader .  cattr_accessor already accepts 
defaults using a block. So just unify the interface.

Example:

class A
  cattr_reader(:defr) { ''default_reader_value'' }
end
A.defr # => ''default_reader_value''


https://github.com/rails/rails/pull/10848

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