What does %Mod{} really do?

Questions & Help Questions
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4

I kind of suspect this might be a bug, as per this evidence:

this seems ok

iex(2)> struct!(XX, field: 1)
%XX{field: 1}
iex(3)> %XX{field: 1}
%XX{field: 1}

this seems wrong

iex(4)> struct!(YY, field: 1)
%XX{field: 1}
iex(5)> %YY{field: 1}
%YY{field: 1}

Does anyone have an explanation for this, or is this a bug?

If %Mod{} is supposed to be the same as calling Mod.__struct__() or struct!(Mod), then it is a bug.

Thanks