API compatibility

[Festus Hagen]

Hi

In commit "Reduce unnecessary memory copies by ByteVector", in function "containsAt(...)" there was a change made to the sanity checking.

Does this NOT break the API ?

The code ... (messed by yahoo)
  // do some sanity checking -- all of these things are needed for the search to be valid

-  if(patternLength > size() || offset >= size() || patternOffset >= pattern.size() || patternLength == 0)
+  if(offset + patternLength > size() || patternOffset >= pattern.size() || patternLength == 0)

-Enjoy
fh : )_~
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