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@@ -395,6 +395,37 @@ with all sufficient information, see the ChangeLog file.
=== Compatibility issues (excluding feature bug fixes)
+* String#slice! had some unintentional bugs and they have been fixed
+ because either they disagreed with documentation or their respective
+ behavior of #slice. Unfortunately, this causes some
+ incompatibilities in the following (somewhat rare) cases.
+
+ * #slice! no longer expands the array when an out-of-boundary value
+ is given.
+
+ # Ruby 1.8.6
+ a = [1,2]
+ a.slice!(4,0) #=> nil
+ a #=> [1,2,nil,nil]
+
+ # Ruby 1.8.7
+ a = [1,2]
+ a.slice!(4,0) #=> nil
+ a #=> [1,2]
+
+ * #slice! no longer raises an exception but returns nil when a
+ negative length or out-of-boundary negative position is given.
+
+ # Ruby 1.8.6
+ a = [1,2]
+ a.slice!(1,-1) #=> (raises IndexError)
+ a.slice!(-5,1) #=> (raises IndexError)
+
+ # Ruby 1.8.7
+ a = [1,2]
+ a.slice!(1,-1) #=> nil
+ a.slice!(-5,1) #=> nil
+
* String#to_i, String#hex and String#oct no longer accept a sequence
of underscores (`__') as part of a number.