Chris Angelico wrote:
a naive ASCII upper-casing wouldn't produce 0x81 either - if it did, it
would also convert 0x21 ("!") into 0x01 (SOH, a control character). So
this one's still a mystery.
It's unlikely that even a naive ascii upper/lower casing algorithm
would be *that* naive; it would have to check that the character
appeared to be a letter before changing it.
You might expect bytes >= 0x80 to be classed as non-letters by
that test, but what if it ignores the top bit or assumes it's
a parity bit to be left alone? What do you get under those
assumptions?
--
Greg
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