https://api.drupal.org/api/drupal/core%21modules%21jsonapi%21tests%21src%21Functional%21ExternalNormalizersTest.php/function/ExternalNormalizersTest%3A%3AtestFormatAgnosticNormalizers/8.9.x
function ExternalNormalizersTest::testFormatAgnosticNormalizers | Drupal API
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