Bug #4760 ยป 0001-Improve-documentation-of-Hash-key.patch
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* call-seq:
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* hsh.key(value) -> key
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*
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* Returns the key for a given value. If not found, returns <code>nil</code>.
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* Returns the key of the first occurrence of a given value. If the value is
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* not found, returns <code>nil</code>.
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*
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* h = { "a" => 100, "b" => 200 }
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* h = { "a" => 100, "b" => 200, "c" => 300, "d" => 300 }
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* h.key(200) #=> "b"
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* h.key(300) #=> "c"
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* h.key(999) #=> nil
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*
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*/
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