How to call an internal function in bash if I defined the same name?

Question

I want to overload functionality cdin bash so that I can perform 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 cd

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

Answer 1

Use the builtin builtin function:

cd () {
    builtin cd "$@"
}

Answer 2

See also here for various attempts to work around this.