How to clear number registers

Hi,

I want to set the contents of the numbered registers ( 1-9) to nothing, each
time I enter a buffer. Thus only yanks and deletes done in the current buffer
will make their way into numbered registers. To this end, I put the following
autocommand in my .vimrc file:

au BufRead * for i in range(1,9) | let @i = "" | endfor

Tha shoud let @1 = "" and @2 = "" and so on. But the i variable never iterates
to numbers. Instead this line just sets the register named, i, to nothing.
I've tried quoting i, using eval etc. Always, the i is not evaluated as a
number in the let statements. I must be doing something simple wrong?

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