SPDX-License-Identifier
ISC OR MIT

example of dual and granular licensed project 🤷

~~I wish GitHub API able to recognize dual-licensed repo 😞~~ GitHub now detect multiple licenses 🎉

Test

Bulk-license whole directories
Using SPDX short-form identifiers to communicate FOSS license information in each file in your project
REUSE guide on how to use license comment headers
SPDX License Expressions Grammar (in ABNF)
How to structure License files by REUSE
Example valid Copyright Notices by REUSE
Copyright Symbol by SPDX
SPDX file tags
SPDX Specification
REUSE Specification

lc - CLI which scans directories and identifies what software license things are.

This work is dual-licensed under either ISC or MIT.

_{The purpose of MIT license is to avoid misinterpretation by countries and regions that are not yet signatories to the Berne Convention while ISC license still preferred.}