code: function( buffer, dstOffset, srcOffset, t, stride ) {
  
  		if ( t >= 0.5 ) {
  
  			for ( var i = 0; i !== stride; ++ i ) {
  
  				buffer[ dstOffset + i ] = buffer[ srcOffset + i ];
  
  			}
  
  		}
  
  	}
docs: mix functions