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Editing: index.js

const eCache = {};
const dCache = {};

/**
 * Encode URI component with `try {} catch` and caching.
 *
 * @param {string} str - decoded string.
 * @return {string} - new encoded string.
 */
export function maybeEncode( str ) {
	// return cached string.
	if ( eCache[ str ] ) {
		return eCache[ str ];
	}

let result = {};

// Object
	if ( typeof str === 'object' ) {
		Object.keys( str ).forEach( ( k ) => {
			result[ maybeEncode( k ) ] = maybeEncode( str[ k ] );
		} );

return result;
	}

// String
	result = str;

if ( typeof result === 'string' ) {
		try {
			// Because of these replacements, some attributes can't be exported to XML without being broken. So, we need to replace it manually with something safe.
			// https://github.com/WordPress/gutenberg/blob/88645e4b268acf5746e914159e3ce790dcb1665a/packages/blocks/src/api/serializer.js#L246-L271
			result = result.replace( /--/gm, '_u002d__u002d_' );

result = encodeURIComponent( result );
		} catch ( e ) {
			// eslint-disable-next-line no-console
			console.warn( e );
		}
	}

// save to cache.
	eCache[ str ] = result;

return result;
}

/**
 * Encode URI component with `try {} catch` and caching.
 *
 * @param {string} str - decoded string.
 * @return {string} - new encoded string.
 */
export function maybeDecode( str ) {
	// return cached string.
	if ( dCache[ str ] ) {
		return dCache[ str ];
	}

let result = {};

// Object
	if ( typeof str === 'object' ) {
		Object.keys( str ).forEach( ( k ) => {
			result[ maybeDecode( k ) ] = maybeDecode( str[ k ] );
		} );

return result;
	}

// String
	result = str;

if ( typeof result === 'string' ) {
		try {
			result = decodeURIComponent( result );

// Because of these replacements, some attributes can't be exported to XML without being broken. So, we need to replace it manually with something safe.
			// https://github.com/WordPress/gutenberg/blob/88645e4b268acf5746e914159e3ce790dcb1665a/packages/blocks/src/api/serializer.js#L246-L271
			result = result.replace( /_u002d__u002d_/gm, '--' );
		} catch ( e ) {
			// eslint-disable-next-line no-console
			console.warn( e );
		}
	}

// save to cache.
	dCache[ str ] = result;

return result;
}