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The IBM 503, the last valve computer, that Cobol and Fortran, the first languages were developed on, had 20 bit words.
So an 80 column card could fit 4 words across. Thats why teletypes and terminals had 80 coulmns of text - so they were the same size as punch cards.
Fortran only used 72 columns, so the last 8 were unused.
It seems weird, but on early computers bytes were not based on multiples of 8 or 4 (like 8 but, 16 bit, 32 bit etc). Some computers had 15, 10, 7, 25, even 50 bit words.
Theres heaps of stuff that is under-developed or mssing, but they prefer to rewrite working code in Rust, because ideology.
We are witnessing the death of Linux here, no less, replacing a working kernal with an still undefined language that everyone will have forgotten in 5 years.