archive/tar: unexport internal methods

Many of the methods inside the archive/tar package don't need to be
exported. Doing so sets a bad precedent that it's OK to export methods
to indicate an internal public API.  That's not a good idea in general,
because exported methods increase cognitive load when reading code:
the reader needs to consider whether the exported method might be used
via some external interface or reflection.

This CL should have no externally visible behaviour changes at all.

Change-Id: I94a63de5e6a28e9ac8a283325217349ebce4f308
Reviewed-on: https://go-review.googlesource.com/c/go/+/341410
Reviewed-by: Joe Tsai <joetsai@digital-static.net>
Trust: Joe Tsai <joetsai@digital-static.net>
Trust: Michael Knyszek <mknyszek@google.com>
6 files changed
tree: 0dc846636e55968fddbc680c2a9e75ef2554b1fd
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. LICENSE
  15. PATENTS
  16. README.md
  17. SECURITY.md
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