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Highlights of Tcl 8.5
* Features: 8.5 has over 90 TIPs included to provide a wide variety of
new features.
* Bignums: Tcl now supports arbitrary-precision integers, which improves
math operations on large integers.
* Safer interps: Tcl's powerful safe interpreter mechanism now has
improved control of time and command limits in slave interpreters.
* clock command: More robust implementation of command for specifying
time, with significant l10n and i18n improvements.
* dict command: New data structure that allows access to data by value
rather than a variable name, which is substantially faster.
* Additional improvements: Faster list search, new and improved
mathematics procedures, anonymous procedures, new ways to package Tcl
extensions, Tcl-level custom channel types, file and line location
information for each command, and more.
There is of course much, much more.
See [8.5 Changes](http://wiki.tcl.tk/10630) on the wiki for a complete
list of new features.
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