- Use class-scoped instance variables to store the Timezone identifier and singleton instance. Loading a linked zone no longer causes the parent zone's identifier to be changed. The instance method of a linked zone class also now returns an instance of the linked zone class rather than the parent class. Closes #4502.
- The zdumptest utility now compares the TZInfo zone identifier with the zdump zone identifier.
- The zdumptestall utility now exits if not supplied with enough parameters.
- Updated to tzdata version 2006g (https://mm.icann.org/pipermail/tz/2006-May/013590.html).