Permissions hardening prevents Composer scaffolding from copying, causes composer require to fail

If you've installed and run Drupal, the sites/default directory receives permission hardening. This breaks the scaffolding plugin.

  [RuntimeException]                                                                                               
  Could not delete /path/web/sites/default/default.services.yml: 

composer require drupal/openapi drupal/openapi_ui drupal/openapi_ui_redoc drupal/schemata
    1/1:	http://repo.packagist.org/p/provider-latest$46a92f2b264b89accfae0d6579f9b6e022c87a70701dad793daf7963e2bf31df.json
    Finished: success: 1, skipped: 0, failure: 0, total: 1
Using version ^1.0@beta for drupal/openapi                
Using version ^1.0@RC for drupal/openapi_ui
Using version ^1.0@RC for drupal/openapi_ui_redoc
Using version ^1.0@beta for drupal/schemata
./composer.json has been updated
Gathering patches for root package.
Loading composer repositories with package information
Updating dependencies (including require-dev)         
Package operations: 5 installs, 0 updates, 0 removals
Gathering patches for root package.
Gathering patches for dependencies. This might take a minute.
  - Installing drupal/schemata (1.0.0-beta1): Loading from cache
  - Installing drupal/schemata_json_schema (1.0.0-beta1)
  - Installing drupal/openapi (1.0.0-beta6): Loading from cache
  - Installing drupal/openapi_ui (1.0.0-rc2): Loading from cache
  - Installing drupal/openapi_ui_redoc (1.0.0-rc2): Loading from cache
Writing lock file
Generating autoload files
Scaffolding files for drupal/core:
  - Copy [project-root]/.editorconfig from assets/scaffold/files/editorconfig
  - Copy [project-root]/.gitattributes from assets/scaffold/files/gitattributes
  - Copy [web-root]/.csslintrc from assets/scaffold/files/csslintrc
  - Copy [web-root]/.eslintignore from assets/scaffold/files/eslintignore
  - Copy [web-root]/.eslintrc.json from assets/scaffold/files/eslintrc.json
  - Copy [web-root]/.ht.router.php from assets/scaffold/files/ht.router.php
  - Copy [web-root]/.htaccess from assets/scaffold/files/htaccess
  - Copy [web-root]/example.gitignore from assets/scaffold/files/example.gitignore
  - Copy [web-root]/index.php from assets/scaffold/files/index.php
  - Copy [web-root]/INSTALL.txt from assets/scaffold/files/drupal.INSTALL.txt
  - Copy [web-root]/README.txt from assets/scaffold/files/drupal.README.txt
  - Copy [web-root]/robots.txt from assets/scaffold/files/robots.txt
  - Copy [web-root]/update.php from assets/scaffold/files/update.php
  - Copy [web-root]/web.config from assets/scaffold/files/web.config
  - Copy [web-root]/sites/README.txt from assets/scaffold/files/sites.README.txt
  - Copy [web-root]/sites/development.services.yml from assets/scaffold/files/development.services.yml
  - Copy [web-root]/sites/example.settings.local.php from assets/scaffold/files/example.settings.local.php
  - Copy [web-root]/sites/example.sites.php from assets/scaffold/files/example.sites.php

Installation failed, reverting ./composer.json to its original content.