The specification should specify how unary "+" operators are handled

[carmenbianca]

See fsfe/reuse-tool#314

The tool handles this, but the specification does not.

[mxmehl]

Related to #3

[mxmehl]

@silverhook @carmenbianca Do you have an idea how to put this in the spec, and with how much detail? Or would this rather be something for an FAQ item? I mean we adhere to and reference SPDX license identifiers and expressions, so we don't have to explain the whole SPDX spec, right?

[silverhook]

Since this is covered by the SPDX spec which we reference to, I’d lean towards putting into FAQ.

The *GPL-*(+) licenses were deprecated here: https://spdx.github.io/spdx-spec/SPDX-license-list/#a3-deprecated-licenses