How to list multiple fields in "FIELDS" parameter in PyQGIS processing.run ()?

Question

The QGIS "remove duplicates by attribute" tool allows you to remove duplicates across multiple fields.

But how can I list multiple fields when I run this tool with pyqgis processing?

alg_params = {
    'INPUT': Layer,
    'FIELDS': ['field_1', 'field_2'], # does not work
    'OUTPUT': 'TEMPORARY_OUTPUT'
}
fixLayer = processing.run("native:removeduplicatesbyattribute", alg_params)['OUTPUT']

Answer 1

The correct syntax for listing fields in pyqgis processing is:

'FIELDS': 'osm_id;osm_way_id',