nl_tokens: based on https : // github . com / amercier / es6 - mixin
pl_tokens: function mixin ( target , MixinConstructor , ... args ) { let source = new MixinConstructor ( ... args ) let names = Object . getOwnPropertyNames ( MixinConstructor . prototype ) for ( let name of names ) { let val = <mask> [ name ] if ( _ . isFunction ( val ) && name !== 'constructor' ) { target [ name ] = val . bind ( source ) } } }