anchor.diff:    "description": null,
     "slug": "my-pipeline",
     "repository": "git@github.com:acme-inc/my-pipeline.git",
  +  "branch_configuration": null,
  +  "default_branch": "master"
     "provider": {
       "id": "github",
       "webhook_url": "https://webhook.buildkite.com/deliver/xxx",
  
positive.code:   <tr><th><code>steps</code></th><td>An array of the build pipeline steps.<p class="Docs__api-param-eg"><em>Script:</em> <code>{ "type": "script", "name": "Script", "command": "command.sh" }</code></p><p class="Docs__api-param-eg"><em>Wait for all previous steps to finish:</em> <code>{ "type": "waiter" }</code></p><p class="Docs__api-param-eg"><em>Block pipeline (see the <a href="/docs/api/jobs#unblock-a-job">job unblock API</a>):</em> <code>{ "type": "manual" }</code></p></td></tr>
    <tr><th><code>env</code></th><td>The pipeline environment variables. <p class="Docs__api-param-eg"><em>Example:</em> <code>{"KEY":"value"}</code></p></td></tr>
    <tr><th><code>provider_settings</code></th><td>The source provider settings. <p class="Docs__api-param-eg"><em>Example:</em> <code>{ "publish_commit_status": true, "build_pull_request_forks": true }</code></p></td>
    <tr><th><code>skip_queued_branch_builds</code></th><td>Skip intermediate builds. When a new build is created on a branch, any previous builds that haven't yet started on the same branch will be automatically marked as skipped.<p class="Docs__api-param-eg"><em>Example:</em> <code>true</code><br><em>Default:</em> <code>false</code></p></td>
    <tr><th><code>skip_queued_branch_builds_filter</code></th><td>A <a href="/docs/pipelines/branch-configuration#branch-pattern-examples">branch filter pattern</a> to limit which branches intermediate build skipping applies to. <p class="Docs__api-param-eg"><em>Example:</em> <code>"!master"</code><br><em>Default:</em> <code>null</code></p></td>
    <tr><th><code>cancel_running_branch_builds</code></th><td>Cancel intermediate builds. When a new build is created on a branch, any previous builds that are running on the same branch will be automatically cancelled.<p class="Docs__api-param-eg"><em>Example:</em> <code>true</code><br><em>Default:</em> <code>false</code></p></td>
  
negative.code:   "description": null,
    "slug": "my-pipeline",
    "repository": "git@github.com:acme-inc/new-repo.git",
    "branch_configuration": "master",
    "default_branch": "master"
    "provider": {
      "id": "github",
      "webhook_url": "https://webhook.buildkite.com/deliver/xxx",
  