If I try a filtered URL like:
https://my.adminjs.server/admin/resources/myresource?filters.enumField=foo&filters.enumField=bar
The query only looks for WHERE enumField = 'foo'
This is because of line 16 in @adminjs/sequelize/lib/utils/convert-filter.js:
if (property.sequelizePath.values || uuidRegex.test(value.toString())) {
Since it is an enum field, this intercepts before it gets to the check for isArray and returns an Op.eq where clause instead of an Op.in clause.