docs: function setValue ( to, handleNumber ) {
  
              // Setting with null indicates an 'ignore'.
              // Inputting 'false' is invalid.
              if ( to === null || to === false ) {
                  return;
              }
  
              // If a formatted number was passed, attemt to decode it.
              if ( typeof to === 'number' ) {
                  to = String(to);
              }
  
              to = options.format.from(to);
  
              // Request an update for all links if the value was invalid.
              // Do so too if setting the handle fails.
              if ( to !== false && !isNaN(to) ) {
                  setHandle(handleNumber, scope_Spectrum.toStepping(to), false, false);
              }
          }