Kind of funny. Computer nerds will instantly spot the (bit) reason for the limitation in $$ amount.
https://www.zerohedge.com/markets/buffetts-refusal-split-berkshire-stock-cre...
What's interesting is they are still allowing 4 "cents" digits. I guess it's a holdover from the fraction days where stocks were "10 1/8". I'm pretty sure no broker lets you trade in anything less than a cent these days.
I wonder if their fix is to switch to 2 digit cents, or move to 64-bit systems and storage. My guess is the former would be infinitely easier, though you may lose some historical precision if you make the change retroactive.
If they go 2-digit cents, Buffett can grow to $42M a share... which should take a decade at least (depending on inflation levels). :-)