src/vs/platform/configuration/common/configurationRegistry.ts/ConfigurationRegistry/updatePropertyDefaultValue
class ConfigurationRegistry:	private updatePropertyDefaultValue(key: string, property: IConfigurationPropertySchema): void {
		let defaultValue = this.defaultValues[key];
		if (types.isUndefined(defaultValue)) {
			defaultValue = property.default;
		}
		if (types.isUndefined(defaultValue)) {
			defaultValue = getDefaultValue(property.type);
		}
		property.default = defaultValue;
	}