System: Mac OS Mojave

Even though a package was provided, and Tk is started, package provide
is not reporting any version number.

Built with Tcl core-8-6-branch and Tk core-8-6-branch.

$
% package require Tk
attempt to provide package Tk 8.6.8 failed: package Tk 8.6.9 provided instead
% package provide Tk
%