7 methods override ComplexDataNormalizer::normalize()

BooleanItemNormalizer::normalize in core/modules/serialization/tests/modules/test_fieldtype_boolean_emoji_normalizer/src/Normalizer/BooleanItemNormalizer.php
ConfigEntityNormalizer::normalize in core/modules/serialization/src/Normalizer/ConfigEntityNormalizer.php
ContentEntityNormalizer::normalize in core/modules/serialization/src/Normalizer/ContentEntityNormalizer.php
EntityReferenceFieldItemNormalizer::normalize in core/modules/serialization/src/Normalizer/EntityReferenceFieldItemNormalizer.php
StringNormalizer::normalize in core/modules/jsonapi/tests/modules/jsonapi_test_field_type/src/Normalizer/StringNormalizer.php
TextItemSillyNormalizer::normalize in core/modules/serialization/tests/modules/field_normalization_test/src/Normalization/TextItemSillyNormalizer.php
TimestampItemNormalizer::normalize in core/modules/serialization/src/Normalizer/TimestampItemNormalizer.php

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