Consider the following two functions:function slow_git_prompt_info() {  if [[ $(command git config --get oh-my-zsh.hide-status 2>/dev/null) != 1 ]]; then    ref=$(command git symbolic-ref HEAD 2> /dev/null) || \    ref=$(command git rev-parse --short HEAD 2> /dev/null) || return 0    echo $ZSH_THEME_GIT_PROMPT_PREFIX${ref#refs/heads/}$(parse_git_dirty)$ZSH_THEME_GIT_PROMPT_SUFFIX  fi}and:function branch_name_only_git_prompt_info() {  ref=$(git symbolic-ref HEAD 2> /dev/null) || return  echo $ZSH_THEME_GIT_PROMPT_PREFIX${ref#refs/heads/}$ZSH_THEME_GIT_PROMPT_SUFFIX}I would like to define another third function that, when called, overrides/defines the function git_prompt_info() in the main namespace to make it point to fast_git_prompt_infoE.g. something like:# Pseudo-code:function redefine_git_prompt_info() {   git_prompt_info = branch_name_only_git_prompt_info}Is this at all possible with Zsh? If so, how?
Overridable functions in Zsh
zsh;oh my zsh