cmp: Unnecessary use of usize for --bytes limit and --ignore-inital values #184
Description
The variables for --bytes, --ignore-initial and line count where size 'usize', thus limiting the readable bytes on 32-bit systems, while GNU cmp is compiled with LFS (Large File Support) and allows i64 values.
There is no reason to implement a 32-bit barrier for 32 bit machines,when Rust supports u64 on all systems.
The --bytes limit could be set to 'u128' to support really large numbers. The performance impact would be negligible, as there only few calculations each time a full block is read from the file.
I changed the variable types with PR #183 . This makes PR #172 obsolete.