code: function validateIf( inlineValues, values ) {
  
  			if ( "_if" in inlineValues ) {
  
  				var value = inlineValues[ "_if" ];
  				delete inlineValues[ "_if" ];
  
  				var params = {};
  
  				var condition = value.replace( ifRegex, function( match, varname ) {
  					if( ! varname ) return match;
  
  					var resolved = resolveName( varname, values );
  
  					// check for semantic falsy values
  					if ( options.semanticIf === true ) {
  						resolved = [ "no", "off" ].indexOf( resolved ) === -1;
  
  					} else if ( mout.lang.isArray( options.semanticIf ) ) {
  						resolved = options.semanticIf.indexOf( resolved ) === -1;
  
  					} else if ( mout.lang.isFunction( options.semanticIf ) ) {
  						resolved = options.semanticIf( resolved );
  					}
  
  					params[ varname ] = resolved;
  
  					return "params['" + varname + "']";
  				});
  
  				try {
  					/* jshint evil:true */
  					/* eslint-disable no-eval */
  
  					return ! eval( condition );
  
  				} catch( e ) {
  					grunt.log.error( "Invalid if condition: '" + value + "'" );
  				}
  			}
  
  			return false;
  		}
docs: Handle _if attributes in inline arguments