Broken FBX skeletal mesh export

[GarmOfGnipahellir]

Describe the bug
Skeleton/armatures won't get exported with FBX.

To Reproduce
Steps to reproduce the behavior:

1. Create a skeletal mesh export collection with an armature
2. Export it
3. It won't have a skeleton

Expected behavior
Export should contain the skeleton.

Device:

• OS: Windows 10
• Blender Version: 2.91

Additional context
I suspect the export settings is at fault:

def export_fbx(filepath):
    """Export an FBX with standardized settings."""
    return bpy.ops.export_scene.fbx(
        filepath=filepath,
        check_existing=False,
        use_selection=True,
        global_scale=1.0,
        apply_unit_scale=True,
        apply_scale_options='FBX_SCALE_NONE',
        bake_space_transform=True,
        object_types={'EMPTY', 'MESH', 'OTHER'}, # <-- Shouldn't this contain 'ARMATURE' as well?
        use_armature_deform_only=True,
        mesh_smooth_type='FACE',
        add_leaf_bones=False,
        embed_textures=False,
        axis_forward='-Z',
        axis_up='Y',
    )

I'll have a fix for this in my fork if this is in fact a bug.