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function _wp_prepare_json_schema_for_client_with_allowed_keywords( array $schema, array $allowed_keywords ): array {
	if ( isset( $schema['type'] ) && 'object' === $schema['type'] && isset( $schema['default'] ) ) {
		$default = $schema['default'];
		if ( is_array( $default ) && empty( $default ) ) {
			$schema['default'] = (object) $default;
		}
	}

	$schema = array_intersect_key( $schema, $allowed_keywords );

	/*
	 * Collect draft-03 per-property `required: true` flags into a draft-04
	 * `required` array of property names on the parent object schema.
	 *
	 * This mirrors rest_validate_object_value_from_schema(), where a draft-04
	 * `required` array takes precedence: when one is present, per-property
	 * booleans are ignored during validation. They are therefore left out of
	 * the array here as well (but still stripped from the output) so the
	 * published schema describes exactly what gets enforced.
	 */
	if ( isset( $schema['properties'] ) && is_array( $schema['properties'] ) ) {
		$has_required_array = isset( $schema['required'] ) && is_array( $schema['required'] );
		$required           = array();
		foreach ( $schema['properties'] as $property => &$property_schema ) {
			if ( is_array( $property_schema ) && ! wp_is_numeric_array( $property_schema ) && isset( $property_schema['required'] ) && is_bool( $property_schema['required'] ) ) {
				if ( ! $has_required_array && true === $property_schema['required'] ) {
					$required[] = (string) $property;
				}
				unset( $property_schema['required'] );
			}
		}
		unset( $property_schema );

		/*
		 * Property keys are unique, so the collected list needs no deduplication.
		 * When a draft-04 array is already present, leave it untouched.
		 */
		if ( ! $has_required_array && count( $required ) > 0 ) {
			$schema['required'] = $required;
		}
	}

	/*
	 * A boolean `required` outside of an object's property list has no draft-04
	 * equivalent, so drop it rather than emit an invalid keyword.
	 */
	if ( isset( $schema['required'] ) && is_bool( $schema['required'] ) ) {
		unset( $schema['required'] );
	}

	/*
	 * Sub-schema maps: keys are user-defined, values are sub-schemas.
	 * Note: 'dependencies' values can also be property-dependency arrays
	 * (numeric arrays of strings) which are skipped via wp_is_numeric_array().
	 */
	foreach ( array( 'properties', 'patternProperties', 'definitions', 'dependencies' ) as $keyword ) {
		if ( isset( $schema[ $keyword ] ) && is_array( $schema[ $keyword ] ) ) {
			foreach ( $schema[ $keyword ] as $key => $child_schema ) {
				if ( is_array( $child_schema ) && ! wp_is_numeric_array( $child_schema ) ) {
					$schema[ $keyword ][ $key ] = _wp_prepare_json_schema_for_client_with_allowed_keywords( $child_schema, $allowed_keywords );
				}
			}
		}
	}

	// Single sub-schema keywords.
	foreach ( array( 'not', 'additionalProperties', 'additionalItems' ) as $keyword ) {
		if ( isset( $schema[ $keyword ] ) && is_array( $schema[ $keyword ] ) && ! wp_is_numeric_array( $schema[ $keyword ] ) ) {
			$schema[ $keyword ] = _wp_prepare_json_schema_for_client_with_allowed_keywords( $schema[ $keyword ], $allowed_keywords );
		}
	}

	// Items: single schema or tuple array of schemas.
	if ( isset( $schema['items'] ) && is_array( $schema['items'] ) ) {
		if ( ! wp_is_numeric_array( $schema['items'] ) ) {
			$schema['items'] = _wp_prepare_json_schema_for_client_with_allowed_keywords( $schema['items'], $allowed_keywords );
		} else {
			foreach ( $schema['items'] as $index => $item_schema ) {
				if ( is_array( $item_schema ) && ! wp_is_numeric_array( $item_schema ) ) {
					$schema['items'][ $index ] = _wp_prepare_json_schema_for_client_with_allowed_keywords( $item_schema, $allowed_keywords );
				}
			}
		}
	}

	// Array-of-schemas keywords.
	foreach ( array( 'anyOf', 'oneOf', 'allOf' ) as $keyword ) {
		if ( isset( $schema[ $keyword ] ) && is_array( $schema[ $keyword ] ) ) {
			foreach ( $schema[ $keyword ] as $index => $sub_schema ) {
				if ( is_array( $sub_schema ) && ! wp_is_numeric_array( $sub_schema ) ) {
					$schema[ $keyword ][ $index ] = _wp_prepare_json_schema_for_client_with_allowed_keywords( $sub_schema, $allowed_keywords );
				}
			}
		}
	}

	return $schema;
}