[http://sf.net/projects/tcl/files/Tcl/8.6.6/tcltk-release-notes-8.6.6.txt/view%|%Released] July 27, 2016. **Tcl Changes** Updated to use [Unicode] 9.0. ***Changes to Tcl Commands*** ****Expanded Syntax / New Options**** ****Modified Behavior**** * [file] support for more Windows filesystem conventions * [namespace upvar] ignores custom resolvers * [namespace delete] now has linear performance in size of namespace ---- **Tk Changes** ***Changes to Tk Commands*** ****Expanded Syntax / New Options**** * [TIP] 443: More configuration options for [text] tags * [TIP] 446: More information out of [text] undo mechanism ***Look and Feel*** * Appearance fixes for [OSX]/Aqua ---- **Changes to Bundled Packages** ***Updated packages*** * [tcltest] 2.4.0: ([TIP] 447) execution time verbosity option * [registry] 1.3.2: * [Itcl] 4.0.5 * [Thread] 2.8.0 * [sqlite] 3.13.0 <> Documentation | Changes in Tcl/Tk