Whether this registration is drawn inside a section rather than by a slot: it stands in for fields, or it names a section to draw in (PlacedInSectionKey). The section's own host mounts it, so a slot host must not mount it a second time.
Whether this registration is drawn inside a section rather than by a slot: it stands in for fields, or it names a section to draw in (PlacedInSectionKey). The section's own host mounts it, so a slot host must not mount it a second time.