nl_tokens: In some cases you may want to annotate computed properties with additional metadata about how they function or what values they operate on . For example computed property functions may close over variables that are then no longer available for introspection .
pl_tokens: function ( key ) { var meta = this . proto ( ) [ META_KEY ] , desc = meta && meta . descs [ key ] ; Ember . assert ( "metaForProperty() could not find a computed property with key '" + <mask> + "'." , ! ! desc && desc instanceof Ember . ComputedProperty ) ; return desc . _meta || { } ; }