How about the following: Introduce new tokens, called "alpha", "beta" and "pre", with sort ordering
alpha < beta < pre < '' < number. We then have (taking as example the 2.0 pre Linux kernel series): 1.3.89 < .. < 1.3.99 < 2.0pre1 < 2.0pre2 < .. < 2.0pre17 < 2.0.0 Christian
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