Tcl.pm tests in repo but omitted from releases

There=E2=80=99s a few tests in the git repository for Tcl.pm which =
aren=E2=80=99t in the releases (not in MANIFEST?):
dispsosal-subs-[abcdef].t, memleak-a.t, and set-callback.t.

Are these being excluded on purpose (i.e. they are developer-only rather =
than installation tests), or should they be included in releases?

Also, some of them (disposal-subs-a.t and memleak-a.t) use =
Devel::Refcount, which isn=E2=80=99t declared as a test dependency in =
Makefile.PL.=