This file is indexed.

/usr/share/tcltk/tls1.6/pkgIndex.tcl is in tcl-tls 1.6+dfsg-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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package ifneeded tls 1.6 \
    "[list source [file join $dir tls.tcl]] ; \
     [list tls::initlib /usr/lib libtls1.6.so]"