/replaceitem keep stack size

It would be far more handy for the /replaceitem command to have an option to keep the stack size, because currently you cannot add an NBT tag to a stack of items without iterating over every stack size possibility to determine what size it is, then have 64 separate commands in datapacks.

Maybe something like where the [<count>] parameter is, we can specify "keep" instead of a number, and the stack size will then remain the same size as what it's replacing.