v3.1.0-beta.5

CHANGELOG

• #15601 [BUGFIX] Ensure Mixin.prototype.toString does not return constructor code
• #16326 [BUGFIX] Expanded syntax error for if handlebars helper to include source of error
• #16347 [BUGFIX] Adds toJSON to list of descriptorTrap assertion exception
• #16350 [BUGFIX] Fix initialiters tests blueprints
• #16351 [BUGFIX] Bring RSVP.cast back from the dead
• #16365 [BUGFIX] Fold all trap methods together