lib/Ext/field/Field.js
function(property, obj, newProperty) {
                if (config.hasOwnProperty(property)) {
                    if (obj) {
                        config[obj] = config[obj] || {};
                        config[obj][(newProperty) ? newProperty : property] = config[obj][(newProperty) ? newProperty : property] || config[property];
                    } else {
                        config[newProperty] = config[property];
                    }

                    delete config[property];

                    //<debug warn>
                    Ext.Logger.deprecate("'" + property + "' config is deprecated, use the '" + ((obj) ? obj + "." : "") + ((newProperty) ? newProperty : property) + "' config instead", 2);
                    //</debug>
                }
            }
function(property, obj, newProperty) {
                if (config.hasOwnProperty(property)) {
                    if (obj) {
                        config[obj] = config[obj] || {};
                        config[obj][(newProperty) ? newProperty : property] = config[obj][(newProperty) ? newProperty : property] || config[property];
                    } else {
                        config[newProperty] = config[property];
                    }

                    delete config[property];

                    //<debug warn>
                    Ext.Logger.deprecate("'" + property + "' config is deprecated, use the '" + ((obj) ? obj + "." : "") + ((newProperty) ? newProperty : property) + "' config instead", 2);
                    //</debug>
                }
            }
helper method for deprecating a property