src/vs/platform/configuration/common/configurationModels.ts/Configuration/compareAndUpdateApplicationConfiguration
class Configuration:	compareAndUpdateApplicationConfiguration(application: ConfigurationModel): IConfigurationChange {
		const { added, updated, removed, overrides } = compare(this.applicationConfiguration, application);
		const keys = [...added, ...updated, ...removed];
		if (keys.length) {
			this.updateApplicationConfiguration(application);
		}
		return { keys, overrides };
	}