How is "Araby" a "coming of age" story, for not only the protagonist but also Mangan's sister?

To be honest, I think it is difficult to argue that this
excellent story is a "coming of age" story for Mangan's sister from the text alone. She
is a vague, shadowy figure, caught up more in the narrator's romantic illusions of her
than anything else. She remains an insubstantial figure, who after she speaks to the
narrator and he pledges to go to the bazaar for her, does not appear again. There is no
indication that she learns anything or experiences an epiphany, as the narrator clearly
does.

The narrator by the end of the story does experience
a "coming of age," as we see in the way that his romantic notions of his quest, of the
bazaar and of Mangan's sister are, in one moment, rejected as he realises the reality of
what is happening to him and who he is. The bazaar is not the magical place that he
expects it to be, but a disappointing, shabby affair that is mostly covered in darkness.
The final paragraph of this story contains the epiphany that indicates how he
develops:

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Gazing up in to the darkness I saw myself as a
creature driven and derided by vanity; and my eyes burned with anguish and
anger.

He realises that his
romantic illusions were precisely those: mere illusions which had no impact on reality,
and he leaves the bazaar a wiser, if not sadder, individual.