Winston Regression between 0.6.2 and 0.7.1

test.js

var winston = require("winston");

var logger = new winston.Logger({
    levels: {
        debug: 0,
        info: 1,
        warn: 2,
        error: 3
    },
  transports: [
      new winston.transports.Console({
          level: 'debug',
          colorize: true
      })
  ]
});

console.log('Winston Version: ' + winston.version);

console.log('\nProxy Methods\n');
logger.info("Hello world");
logger.warn("Hello world", { winston: {
    version: winston.version
}});

console.log('\nDirect Access Methods\n')
logger.log('info', "Hello world");
logger.log('warn', "Hello world", { version: winston.version });

v0.6.2-output

Winston Version: 0.6.2

Proxy Methods

info: Hello world
warn: Hello world version=0.6.2

Direct Access Methods

info: Hello world
warn: Hello world version=0.6.2

v0.7.1-output

Winston Version: 0.7.1

Proxy Methods

info: Hello world
warn: Hello world

Direct Access Methods

info: Hello world
warn: Hello world version=0.7.1