slog: remove Attr.AppendValue

Attr.AppendValue was originally intended to be a convenient and more
efficient way of formatting Attr values. But there is no one clearly
right way to format them, and the efficiency argument doesn't
really hold water: AppendValue skips the redundant but cheap type
check that occurs in

	switch a.Kind() {
	case IntKind:
		... a.Int() ..

but then formats Times and Durations as strings instead of integers.

We keep it internally to help out in a couple of places, but overall
it's better if Handler implementations do their own value formatting.
For casual use, fmt.Sprint(a.Value()) is fine.

Change-Id: Ie265f1ee5daf5f8002bfc2b70f4bf461cb07a10b
Reviewed-on: https://go-review.googlesource.com/c/exp/+/430098
Run-TryBot: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
4 files changed
tree: 46d323ed6a106bd988689a91da452449a4c4a4f9
  1. apidiff/
  2. cmd/
  3. constraints/
  4. devtools/
  5. ebnf/
  6. ebnflint/
  7. errors/
  8. event/
  9. inotify/
  10. io/
  11. jsonrpc2/
  12. maps/
  13. mmap/
  14. rand/
  15. shiny/
  16. shootout/
  17. slices/
  18. slog/
  19. sumdb/
  20. typeparams/
  21. utf8string/
  22. .gitattributes
  23. .gitignore
  24. codereview.cfg
  25. CONTRIBUTING.md
  26. go.mod
  27. go.sum
  28. LICENSE
  29. PATENTS
  30. README.md
README.md

exp

PkgGoDev

This subrepository holds experimental and deprecated (in the old directory) packages.

The idea for this subrepository originated as the pkg/exp directory of the main repository, but its presence there made it unavailable to users of the binary downloads of the Go installation. The subrepository has therefore been created to make it possible to go get these packages.

Warning: Packages here are experimental and unreliable. Some may one day be promoted to the main repository or other subrepository, or they may be modified arbitrarily or even disappear altogether.

In short, code in this subrepository is not subject to the Go 1 compatibility promise. (No subrepo is, but the promise is even more likely to be violated by go.exp than the others.)

Caveat emptor.