* generic/tclBasic.c: Use new interface in Tcl_EvalObjEx so that

        the recounting logic of the List internal rep need not be repeated
        there.  Better encapsulation of internal details.

        * generic/tclInt.h:     New internal routine TclListObjCopy() used
        * generic/tclListObj.c: to efficiently do the equivalent of
        [lrange $list 0 end].  After some experience with this, might be
        a good candidate for exposure as a public interface.  It's useful
        for callers of Tcl_ListObjGetElements() who want to control the
        ongoing validity of the returned objv pointer.

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