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gtk_print_context_get_hard_margins documentation

I am trying to use gtk_print_context_get_hard_margins API to ensure that my margin settings do not go below printer's hard settings.
The API is documented as:
"Obtains the hardware printer margins of the GtkPrintContext, in units."

My question is: what units are we talking about here?

Most other printing APIs within the GtkPageSetup (like gtk_page_setup_set_top_margin for example) accept GtkUnit as parameter and return data in desired unit (be it pixels, points, inches or mm).

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