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Markus Triska <markus.triska@gmx.at> writes:

> Use C-M-x for eval-defun:
>
>   If the current defun is actually a call to `defvar' or
>   `defcustom', evaluating it this way resets the variable using its
>   initial value expression even if the variable already has some
>   other value.

Aha! I always use C-x C-e apart from when I am instrumenting a
function for edebug, when I use C-u C-M-x. Cool!