MdSelect integer 0 as Value is not working

[jackovsky8]

Steps to reproduce

I try to use MdSelect with an array of objects like:
types: [{id: 0,name:"Option 1"},{id: 1,name: "Option 2"}],

`<md-field>`
    `<label>Id</label>`
    `<md-select v-model="type_id">`
        `<md-option v-for="item in types" :value="item.id">{{ item.name }}</md-option>`
    `</md-select>`
`</md-field>`

What is actually happening?

Choosing Option 1 is not working correctly - no label is shown.

In the Vue Devtools it shows in the Element MdSelect:
MdSelect:Object
items:Object
1:"Option 2"
md-option-3eb70hnhr:"Option 1"
md-option-5ldo6g1t4:"Option 1"
md-option-8qwf8bb4e:"Option 1"
md-option-b2d52ef6:"Option 1"
md-option-fly0yb5x7:"Option 1"
md-option-jqu2sg9y5:"Option 1"

The value is saved correctly in the model 'type_id'

Reproduction Link

https://codepen.io/jackovsky888/pen/jaxWKG?editors=1111