Comment 1:

I'm not so sure. New unicode standards come out all the time. 6.0 seems like a fine,
tested base for Go 1.
A more important question is how the unicode standards that roll out during the life of
Go 1 will affect compatibility. Do we need to say something in the compatibility
document?

Comment 2:

The only real issue I could see would be if a Unicode character moved in or out of class
Lu or out of classes Ll, Lt, Lm, Lo, or Nd.  If we want to be really precise we should
list those as possibly breaking backward compatibility for Go 1 source code.
I don't think we should worry about the fact that future Unicode standards could change
the behaviour of Go 1 programs that use the unicode package.  I think that is an
acceptable sort of package change, even though it will cause program behaviour to
change.  I don't think we need to mention this specifically.

Comment 3:

Marking this Later, given the disinclination to update.
The people who need Meroitic Cursive will have to wait.
I did a trial maketables to skim the diffs.  The most significant
change in Unicode 6.1.0 (beyond putting blank lines in
CaseFolding.txt and thereby breaking maketables) is
that the ordinal indicators ª º are now Lo instead of Ll.
This breaks the assumption in IsLetter that all Latin-1
letters are either Ll or Lu, which will mean adding a way
to express that in the properties table, but we're out of bits.
Probably we could use pLl|pLu to mean Lo.
If you want to see the diffs,
http://golang.org/cl/5616077/diff/3/src/pkg/unicode/tables.go

Labels changed: added priority-later, removed priority-go1.

Comment 4:

Unicode 6.2.0 is slated for release in September. That's probably the one to use for Go
1.1.

Labels changed: added go1.1.

Comment 5:

6.2.0 is out.

Comment 6:

http://golang.org/cl/6818067
http://code.google.com/p/go/source/detail?r=a8ed5d22b36e

Owner changed to @mpvl.

Status changed to Fixed.

Comment 7:

One more: lib9/utf

Owner changed to @robpike.

Status changed to Accepted.

Comment 8:

This issue was closed by revision c15afa8.

Status changed to Fixed.