'How to use ternary operator in Lighting Aura component to toggle button's disabled attribute

I am trying to disable a Lighting Aura button component using ternary operator but it doesn't seems to work, I would really appreciate If someone can explain the reason or point me to any documentation which I can refer.

Thanks you

<lightning:button variant="neutral" label="OK" title="OK" disabled= "{! 1==true?true:false}"  onclick="{!c.transferCall}"/>
<lightning:button variant="neutral" label="OK" title="OK" disabled= "{! 0==true?true:false}"  onclick="{!c.transferCall}"/>
aura-framework


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