custom-initialize-resetcustom-initialize-reset is a compiled Lisp function in `
custom.el'. (custom-initialize-reset SYMBOL EXP) Initialize SYMBOL based on EXP. Set the symbol, using its `:set' function (or `set-default' if it has none). The value is either the symbol's current value (as obtained using the `:get' function), if any, or the value in the symbol's `saved-value' property if any, or (last of all) the value of EXP.