src/vs/platform/configuration/common/configurationModels.ts/ConfigurationInspectValue/applicationInspectValue
class ConfigurationInspectValue:	private get applicationInspectValue(): IInspectValue<V> | null {
		if (this._applicationInspectValue === undefined) {
			this._applicationInspectValue = this.applicationConfiguration ? this.applicationConfiguration.inspect<V>(this.key) : null;
		}
		return this._applicationInspectValue;
	}