On 05/30/2017 02:30 PM, Doug Ewell via Unicode wrote:
L2/17-168 says:
"For UTF-8, recommend evaluating maximal subsequences based on the
original structural definition of UTF-8, without ever restricting trail
bytes to less than 80..BF. For example: <C0 AF> is a single maximal
subsequence because C0 was originally a lead byte for two-byte
sequences."
When was it ever true that C0 was a valid lead byte? And what does that
have to do with (not) restricting trail bytes?
Until TUS 3.1, it was legal for UTF-8 parsers to treat the sequence
<C0 AF> as U+002F.
