Summary of Changes
Developmental releases of Ruby always have an odd minor revision number such as 1.5 or 1.7. Once a developmental release is stable and finalized, it’s then “promoted” to a stable release. Stable releases always have an even minor revision number such as 2.0 or 3.2. Therefore, releases with even subversion numbers (1.4, 1.6, 1.8, etc.) are stable releases. Releases with odd subversion numbers (1.5, 1.7, etc.) are developmental versions and are available only from the CVS repository.
At of the writing of this book, the current stable release version is 1.6.5. The current developmental version is 1.7.1. The changes presented here are currently reflected in 1.7.1 and will probably remain relatively unchanged in the next stable release—Version 1.8.
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