Compare and contrast the behavior of different fs.FS implementations.
Call run.sh to start the comparison.
$ ./run.sh
*** embed demo ***
hello world
open static/not-found: file does not exist
open /intentinally/malformed: file does not exist
OK
*** dirfs demo ***
hello world
open internal/data/static/not-found: no such file or directory
open /intentinally/malformed: invalid argument
OK
*** tarfs demo ***
hello world
readfile static/not-found: file does not exist
readfile /intentinally/malformed: invalid argument
OK
$