The R devs copied from this library some files.

$ svn log -r r9653 R
------------------------------------------------------------------------
r9653 | tlumley | 2000-06-23 17:11:24 -0500 (Fri, 23 Jun 2000) | 2 lines

added Tk directory browser and support code

------------------------------------------------------------------------
$ 

console.tcl
hierarchy.tcl
pkgIndex.tcl
util-dump.tcl
util-expand.tcl
util-number.tcl
util-string.tcl
util-tk.tcl
util.tcl
widget.tcl

Looking at the R source subdirectory src/library/tcltk/exec exposed a few typos.

Would the library devs consider to implement these GNU sed commands to fix them?

$ cat typos.sh
#!/bin/sh

sed -i "s/Specifis/Specifies/g" library/hierarchy.tcl
sed -i "s/forknowledge/foreknowledge/g" library/hierarchy.tcl
sed -i "s/hierachical/hierarchical/g" library/hierarchy.tcl
sed -i "s/hierachy/hierarchy/g" library/hierarchy.tcl
sed -i "s/ie /i.e. /g" library/hierarchy.tcl
sed -i "s/occured/occurred/g" library/hierarchy.tcl
$

For convenience a patch has been attached.