index.js
function updateBoolean(name) {
  name = ' ' + name;
  function update(value) {
    switch (value) {
      case true:
      case 'true':
        return name;
    }
    return '';
  }
  update[UID] = true;
  return update;
}
function updateBoolean(name) {
  name = ' ' + name;
  function update(value) {
    switch (value) {
      case true:
      case 'true':
        return name;
    }
    return '';
  }
  update[UID] = true;
  return update;
}
function updateBoolean ( name ) { name = ' ' + name ; function update ( value ) { switch ( value ) { case true : case 'true' : return name ; } return '' ; } update [ UID ] = true ; return update ; }
return the right callback to update a boolean attribute after modifying the template to ignore such attribute if falsy
return the right callback to update a boolean attribute after modifying the template to ignore such attribute if falsy