Except what about Dates? Or apps were floating point precision is important? Or needing to deal with very large integers? Also, have you thought about how large

Except what about Dates? Or apps were floating point precision is important? Or needing to deal with very large integers? Also, have you thought about how large the output would be for ls as JSON? Think about the I/o usage if every time you invoked ls it had to do a deep walk of the file system to get all the possible data ls might output with all its command line arguments.