src/vs/platform/configuration/common/configurationRegistry.ts/ConfigurationRegistry/updatePropertyDefaultValue
class ConfigurationRegistry:	private updatePropertyDefaultValue(key: string, property: IRegisteredConfigurationPropertySchema): void {
		const configurationdefaultOverride = this.configurationDefaultsOverrides.get(key);
		let defaultValue = configurationdefaultOverride?.value;
		let defaultSource = configurationdefaultOverride?.source;
		if (types.isUndefined(defaultValue)) {
			defaultValue = property.defaultDefaultValue;
			defaultSource = undefined;
		}
		if (types.isUndefined(defaultValue)) {
			defaultValue = getDefaultValue(property.type);
		}
		property.default = defaultValue;
		property.defaultValueSource = defaultSource;
	}