Issue #1880 has been updated by Marc-Andre Lafortune.

Assigned to set to Yukihiro Matsumoto
Priority changed from Low to Normal
Target version set to 1.9.2

Moving this from 'bug' to 'feature request' as behavior corresponds to doc. Currently it converts to an array and (if given an argument) calls flatten on it. Array#flatten leaves hashes alone.

The question remaining: should there be a way to recursively flatten hashes, via Hash#flatten or otherwise?
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http://redmine.ruby-lang.org/issues/show/1880

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