mime: derestrict value backslash unescaping for all encodings

Previously consumeValue performed consumption of "unnecessary backslashes"
strictly for non-ASCII and non-token runes. Thus if it encountered a
backslash before a rune that is out of the ASCII range, it would
erroneously skip that backslash. This change now derestricts
"unnecessary backslash" unescaping for all character encodings,
using "isTSpecial" instead of "!isTokenChar".
This change is a follow-up of CL 32175.

Fixes #25888

Change-Id: I5e02bbf9c42f753a6eb31399b8d20315af991490
Reviewed-on: https://go-review.googlesource.com/119795
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2 files changed
tree: f141f67f3fa5bc4e2d1b616d1696aeb819a7e8a1
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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