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- Upgraded bundled sqlite to version 3.6.23.1. (Ilia)
- Upgraded bundled PCRE to version 8.02. (Ilia)
+- Added concept of interned strings. All strings constants known at compile
+ time are allocated in a single copy and never changed. (Dmitry)
- Added an optimization which saves memory and emalloc/efree calls for empty
HashTables (Stas, Dmitry)
- Added Tokyo Cabinet abstract DB support to ext/dba. (Michael Maclean)