It was created for internal use, and is not part of the context-store
public API. It was introduced as part of the "zip import" functionality
added in 291e86289b. Initially it was
[non-exported][1], but during review, some suggestions were made to improve
the implementation, and the [suggested implementation][2] was based on
Go stdlib, but review overlooked that the implementation was now exported.
Let's un-export it, as this was (as outlined) never meant to be a public
type.
[1]: https://github.com/docker/cli/pull/1895#discussion_r287514522
[2]: https://github.com/docker/cli/pull/1895#discussion_r288688768
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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