docs: function prepareTaxonomies( taxonomyFilters ) {
  	if ( ! taxonomyFilters ) {
  		return {};
  	}
  
  	return objectReduce(
  		taxonomyFilters,
  		( result, terms, key ) => {
  			// Trim whitespace and concatenate multiple terms with +
  			result[ key ] = terms
  				// Coerce term into a string so that trim() won't fail
  				.map( term => ( term + '' ).trim().toLowerCase() )
  				.join( '+' );
  
  			return result;
  		},
  		{}
  	);
  }