Unused functions within the helpers package have been removed.

[tpgus]

• Is this a bug fix, new functionality, or a breaking change?
• Have read and followed the steps for preparing a pull request.

[smallsaucepan]

Thanks @tpgus. We might need to wait until a major release to clean this up though. Although the documentation says @private we do still export the function (admittedly contradictory). Someone may be importing it so I feel we need to keep it available for now.

[tpgus]

@smallsaucepan.

I understand. Thank you for your reply.

[smallsaucepan]

Thanks @tpgus. Will take another look when we're preparing to release Turf 8.