Deprecations when upgrading to Ember >= v3.20.x, {{-in-element}}

[Ava Gaiety Wroten]

A few components in ember-paper rely on the private Ember API of {{-in-element}}, everything after Ember v3.20.x has deprecated that private API in favor of the now public {{in-element}}. https://github.com/emberjs/ember.js/releases/tag/v3.20.0

RFC for this change in Ember

Example: https://github.com/miguelcobain/ember-paper/blob/master/addon/templates/components/paper-tooltip.hbs

[Mohit Sud]

same issue- would love to see this resolved.