Select without "All" default

[listvin]

I want my Select input to be selection only from list with following code:

return <Select
        mandatory={true}
        options={["a","b"]}
        name={"ab"}
        label={"choose a or b"}
/>

But I am getting selection from All, a and b.
I expect mandatory flag to prevent "All" or similar things to be available.

I noticed that if I supply "xx" to placeholder user gets options xx, a and b. However from code perspective I see values "","a","b".
Supplying initialValue does not help -- user can still switch to placeholder value (from his perspective and "" from code perspective)

Am I missing something?

Thank you

[firflant]

@listvin You have to set field as mandatory to disable "All" option from selecting. But pointing madnatory fields happens on Form component level, not the input itself. Here is the example:

<Form fields={['ab']} mandatory={['ab']}>
    <Select
      options={["a","b"]}
      name="ab"
      label={"choose a or b"}
    />
</Form>