nl_tokens: called whenever a property has just changed to update dependent keys
pl_tokens: function dependentKeysDidChange ( obj , depKey , meta ) { if ( obj . isDestroying ) { return ; } var seen = DID_SEEN , top = ! seen ; if ( top ) { <mask> = DID_SEEN = { } ; } iterDeps ( propertyDidChange , obj , depKey , seen , meta ) ; if ( top ) { DID_SEEN = null ; } }