The official developer specification says the component (API v43) has "values" attribute.
A list of default options that are included in the selected options list box. This list is populated with values from the options attribute.
If I understand this correctly the I should be able to set this attribute with a subset of objects I provide in option list.
Now when I try to set it :
1) The right list of the component is empty
2) The console sends me this greeting
WARNING: "values" must either be a public property of lightningDualListbox or a global HTML attribute
Is this a bug or am I misreading the doc?