django - Initial values for CheckboxSelectMultiple -

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i'm initializing form using:

multisubscriptionform(initial={'email': user.email})

in form i'd initialize checkboxselectmultiple widget check set of checkboxes. how can that?

more or less same actually, pass list of values , works.

multisubscriptionform(initial={     'email': user.email,     'multiple_field': ['a', 'b', 'c'], })

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