How do I call internal function in bash if I have defined with the same name?

Question

I want to overload the functionality of cd in bash so that I can do the following checks:

if the directory is not in DIRSTACK -> pushd dir

else cd dir (or cd ~#)

However now I get a recursive loop when trying to cd

The reason for this is that I am trying to work around the fact that bash does not support set dunique

Answer 1

Use the builtin called "builtin":

cd () {
    builtin cd "$@"
}

Answer 2

See also here for various attempts to workaround this.