Looks like some neat changes. Thanks for all the hard work.

I would like left, right, up and down.

so,

$sheet->cellright("A1") # B1
$sheet->celldown("A1") # A2
$sheet->cellright(0,0) # @{1,0}
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This is because I always mess up the numbers (1,1) to the right, is that (1,2) or (2,1) ?

Also not sure what would happen if we go a cell that does not exist, like "A0". Does it croak?

Also not sure why the formatted/unformatted for (0,0) and "A1" is, It seems more logic to have a ->unformatted() to me, but I guess that is how the API is already made and unmutable.

Edit: I just thought that this should also be possible:

$sheet->cellright("A1",3) # D1
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