According to the current SPDX spec, dual-licensing should be done as: (Apache-2.0 OR MIT) (and there's also AND, + and WITH), but our manifest format says one should simply separate licences with / without being 100% clear on whether that means an "AND" or "OR".

This just seems to be an unnecessary inconsistency with the SPDX spec. Can we change the doc to encourage dual-licensing using the (x OR y) syntax instead?