Incrementing and decrementing numbers

I like the ctrl+a and ctrl+x shortcuts for increasing and decreasing numbers, but I noticed

some peculiar behaviors with dashes (Vim 7.2). If I have a string

  data-2-4

When I go to the '2' and hit ctrl a, it seems to treats it as a negative number, so incrementing it

results in data-1-4 (so apparently -2 became -1)

  But if I have the string
  data.2.4

Now, when I go to the '2' and hit ctrl a, the behavior is as expected, result in data.3.4

Is there some flag to allow ctrl+a to always increment a number and not treat the numbers as positive and negative values, and likewise for ctrl+x?

Thanks,

Ven

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