gnucompability(tail): -c accepts some large units that gnu rejects

[HackingRepo]

Hi, uutils mainteners

we confirmed that the uu tail -c accepted, some large units, without errors

relunsec@relunsec:~/software/coreutils/target/debug$ ./tail -c2z a
hello
relunsec@relunsec:~/software/coreutils/target/debug$ gnutail -c2z a
gnutail: invalid number of bytes: ‘2z’
relunsec@relunsec:~/software/coreutils/target/debug$ ./tail -c2e a
hello
relunsec@relunsec:~/software/coreutils/target/debug$ gnutail -c2e a
gnutail: invalid number of bytes: ‘2e’
relunsec@relunsec:~/software/coreutils/target/debug$ ./tail -c2g a
hello
relunsec@relunsec:~/software/coreutils/target/debug$ gnutail -c2g a
gnutail: invalid number of bytes: ‘2g’
relunsec@relunsec:~/software/coreutils/target/debug$ 
relunsec@relunsec:~/software/coreutils/target/debug$ ./tail -c2t a
hello
relunsec@relunsec:~/software/coreutils/target/debug$ gnutail -c2t a
gnutail: invalid number of bytes: ‘2t’
relunsec@relunsec:~/software/coreutils/target/debug$ 

[oech3]

We should not ivergent interface, but I think we can accept them as extension.

[HackingRepo]

yes make that a cargo feature, i think

[oech3]

By defautl, not as optional feature.

[HackingRepo]

ok