all: upgrade Unicode from 13.0.0 to 15.0.0

Update unicode/tables.go to reflect changes in the Unicode Standard up to
Unicode 15.0.0, released 13 Sept 2022.

In order to accommodate this update, strconv/isPrint has been updated to
reflect changes in printable characters.

Also changed is template/exec_test.go for both text and html packages- in
the test "TestJSEscaping", rune U+FDFF was used as a placeholder for an
unprintable character. This codepoint was assigned and made printable in
Unicode 14.0.0, breaking this test. It has been replaced with the assigned
and never-printable U+FFFE to fix the test and provide resiliency in the

This upgrade bypasses Unicode 14.0.0, but is compatible.


Change-Id: I40efd097eb746db0727ebf7437280916d1242e47
GitHub-Last-Rev: c8885cab7a0c23632e1e5a433b1e8d5634a45a30
GitHub-Pull-Request: golang/go#57265
Reviewed-by: Robert Griesemer <>
Run-TryBot: Rob Pike <>
TryBot-Result: Gopher Robot <>
Run-TryBot: Robert Griesemer <>
Reviewed-by: Cherry Mui <>
Reviewed-by: Rob Pike <>
6 files changed
tree: 6d82a8c7b7e2280849645b5a294d2b6c08b31f94
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  12. go.env

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