v3.8.0-beta.1

CHANGELOG

• #17143 / #17375 [FEATURE] Implement Element Modifier Manager RFC (see emberjs/rfcs#0373).
• #17054 / #17376 [FEATURE] Implement array helper RFC (see emberjs/rfcs#0318)
• #16735 [BUGFIX] Observed properties not being marked as enum
• #17319 [CLEANUP] Remove deprecated 'POSITIONAL_PARAM_CONFLICT'
• #17394 [CLEANUP] Remove deprecated code in mixins/array
• #17166 Improve performance of get() / set()
• #16710 Deprecation of (private) NAME_KEY
• #17244 Upgrade to Glimmer VM 0.37.0
• #17216 Use native Error instead of custom Error subclass.
• #17340 Remove unused hooks variable from qunit-rfc-232 util-test blueprint
• #17357 Allow notifyPropertyChange to be imported from @ember/object
• #17413 Fix missing import in instance-initializer blueprint for ember-mocha