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Richard Musiol authored
This is so the values can not be changed and the type is easy to see. Requested on https://go-review.googlesource.com/c/go/+/120561. Change-Id: If2ed48ca3ba8874074687bfb2375d2f5592e8e0d Reviewed-on: https://go-review.googlesource.com/120564Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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