Merge branch 'hash_with_indifferent_access_fix'
The problem: Accessing a HashWithIndifferentAccess does not return the the same object that is stored in the hash (i.e. equal?) causing unexpected results: hash = HashWithIndifferentAccess.new {|h, k| h[k] = []} hash[:a] << 1 # => [1] hash[:a] # => [], expected [1] The cause: When a block is provided to generate default values the generated values are duped if they are arrays. The duped value is stored in the hash but the original value is returned when the hash is accessed. The fix: The duping is there for allowing frozen arrays containing hashes to be modified. The fix restricts the duping to this case. Note that if default function generates a frozen array an error will be raised on assignment before and after the patch. Closes #3811
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