* object.c: Improve documentation of Kernel#Array

Array(arg) does more than just call to_ary or to_a on the argument.
It also falls back to returning [arg] if neither method is available.
This patch extends the description and adds a few examples of how it
handles common types of arguments, including an integer
(which does not implement to_ary or to_a).

Extend Kernel#Array doc to mention TypeError

patched by ragesoss (Sage Ross) [fix GH-1663]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60327 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

object.c

@@ -3609,8 +3609,17 @@ rb_Array(VALUE val)
  *  Returns +arg+ as an Array.
  *
  *  First tries to call <code>to_ary</code> on +arg+, then <code>to_a</code>.
+ *  If +arg+ does not respond to <code>to_ary</code> or <code>to_a</code>,
+ *  returns an Array of length 1 containing +arg+.
  *
+ *  If <code>to_ary</code> or <code>to_a</code> returns something other than
+ *  an Array, raises a <code>TypeError</code>.
+ *
+ *     Array(["a", "b"])  #=> ["a", "b"]
  *     Array(1..5)        #=> [1, 2, 3, 4, 5]
+ *     Array(key: :value) #=> [[:key, :value]]
+ *     Array(nil)         #=> []
+ *     Array(1)           #=> [1]
  */
 
 static VALUE