The v3.18.2 release is a patch release that addresses a regression in the v3.18.1 release. See the [v3.18.0 release notes](https://github.com/openlayers/openlayers/releases/tag/v3.18.0) for details on upgrading from v3.17.x.
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## Fixes
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* [#5828](https://github.com/openlayers/openlayers/pull/5828) - Always close polygon rings ([@ahocevar](https://github.com/ahocevar))