ID_Start, ID_Continue, and stability extensions

Mark Davis ☕️ mark at
Tue Apr 29 00:04:11 CDT 2014

On 25 April 2014 20:53, Karl Williamson <public at> wrote:

> And in fact in some Unicode releases, they contained errors.

I think you know this, but for others.

A derived property value in the UCD is defined by the value in the derived
data file, NOT by the derivation.​ Of course, the value might not follow
the intent, just with any other property, and there are fixes to
properties, whether derived or not, in each release. And sometimes the
statement of the derivation is changed, and sometimes property values are

And the regex recommendations in are
different, so you may be referring to them.

Mark <>

*— Il meglio è l’inimico del bene —*
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