I was experimenting with local variables and set:

(defvar-local foo nil "Buffer local foo")

I later redesigned my program to use a global variable instead using:

(defvar foo nil "Not buffer local foo")

but the variable is still buffer local and even (kill-local-variable 'foo) didn't kill it.

Basically, how can I "undo" make-variable-buffer-local?

I was experimenting with local variables and set:

(defvar-local foo nil "Buffer local foo")

I later redesigned my program to use a global variable instead using:

(defvar foo nil "Not buffer local foo")

but the variable is still buffer local and even (kill-local-variable 'foo) didn't kill it.

Basically, how can I "undo" make-local-variable?