Help: diff-binary
Bounty program for improvements to Tcl and certain Tcl packages.
Tcl 2019 Conference, Houston/TX, US, Nov 4-8
Send your abstracts to tclconference@googlegroups.com
or submit via the online form by Sep 9.

The "diff-binary" setting:

If enabled, permit files that may be binary
or that match the "binary-glob" setting to be used with
external diff programs.  If disabled, skip these files.