strconv: CanBackquote(invalid UTF-8) should be false

[robpike]

The comment says it guarantees the string can be represented, but there is an argument
that bad UTF-8 will surprise someone who backquotes the string and finds it contains
illegal encodings.

For discussion.

See also issue #7565.

[rsc]

Comment 1:

I agree: CanBackquote should return false for strings containing invalid UTF-8.

Labels changed: added release-go1.4.

Status changed to Accepted.

[gopherbot]

Comment 3:

CL https://golang.org/cl/111780045 mentions this issue.

[robpike]

Comment 4:

This issue was closed by revision c0a824a.

Status changed to Fixed.