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travis-ci

<a href="https://github.com/netceteragroup/skele/commit/<a class=hub.com/netceteragroup/skele/commit/2f8bdd022566ad457f954aca70447ba9a25ad181">2f8bdd022<a href="https://github.com/netceteragroup/skele/commit/2f8bdd022566ad457f954aca70447ba9a25ad181">&quot;&gt;perf(core): new implementation of zippers (#122)

Usage of [zippa](https://github.com/tommikaikkonen/zippa) as an implementation for zippers was not performant enough.

We manage to implement zippers in a more performant manner (similar to `clojure.zip` implementation). The benchmarks are giving 300% improvements.

Closes #119 

BREAKING CHANGE: Due to removal of [zippa](https://github.com/tommikaikkonen/zippa) that we previously exposed via `zip` namespace, we have breaking changes. We decided not to implement all the methods that zippa exposed, but only what is needed (and generally used in app-space). The available methods can be seen in this [test](https://github.com/netceteragroup/skele/blob/</a><a class="double-link" href="https://github.com/netceteragroup/skele/commit/<a class="double-link" href="https://github.com/netceteragroup/skele/commit/b8df5ef6275ba7519f81715ed76b937b97563330">b8df5ef62</a>">b8df5ef62</a><a href="https://github.com/netceteragroup/skele/commit/2f8bdd022566ad457f954aca70447ba9a25ad181">/packages/core/src/__tests__/index.js#L71).

497 of 673 branches covered (73.85%)

Branch coverage included in aggregate %.

112 of 112 new or added lines in 7 files covered. (100.0%)

1111 of 1318 relevant lines covered (84.29%)

39.67 hits per line