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The "+" SPDX license operator is not recognized

Namcap 3.5.2-1 does not recognize license expressions with a + at the end as valid licenses. + is used to indicate that any later version of the license can also be used, as defined in the RFC.

Example:

# PKGBUILD
pkgname=foo
pkgver=1
pkgrel=1
arch=(any)
license=('Apache-2.0+')
$ makepkg
[...]
$ namcap foo-1-1-any.pkg.tar.zst
foo E: Apache-2.0+ is not a valid SPDX license identifier. See https://spdx.org/licenses/ for valid identifiers, or prefix the identifier with 'LicenseRef-', if it is custom.

However, I think that the + operator should only be allowed for versioned licenses, and expressions like MIT+ or GPL-2.0-only+ should still raise an error.

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