Part of Tcl's public C API, to execute Tcl scripts.

Reference manpages:

   * http://www.tcl.tk/man/tcl8.6/TclLib/Eval.htm
   * http://docs.activestate.com/activetcl/8.5/tcl/TclLib/Eval.htm



`Tcl_Eval*` look like [Tcl_Obj refCount HOWTO%|%Readers], but they're really [Tcl_Obj refCount HOWTO%|%Hairy Monsters] (1).



** References **

   1:   [KBK], [Tcl Chatroom], 2014-11-24


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