os/user: note in doc that user.Current is being cached
user.Current caches the current user after its first call, so changes to the uid after the first call will not affect its result. As this might be unexpected, it should be mentioned in the docs. Fixes #27659 Change-Id: I8b3323d55441d9a79bc9534c6490884d8561889b Reviewed-on: https://go-review.googlesource.com/136315Reviewed-by:Ian Lance Taylor <iant@golang.org>
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