md-select issue when md-options have any painr values of 0, ' ' and false together

[sohail85]

• What is the issue? *
md-select does not trigger change event (with static options) having pair of values ' ' and 0 and false or any other javascript falsy values, so every time user changes the drop-down values between options with falsy values neither ng-chnage event triggered nor the bound model gets updated.
• Here is the link to material select codepen (unexpected behavior)
• What is the expected behavior?
  how ever it should identify if user changed between different values even if user switches between options with values 0 and ' ' or false.
• Here is the link to angular select codepen (expected behaviour)

try to switch between item0 , false and blank options