I'm interested in borrowing functions from a file in a project dual-licensed as MIT-or-UNLICENSE in my package that I intend to also be dual-licensed as Apache-or-MIT. Is this possible? How should I properly cite the borrowed source?
My first thought is to add a disclaimer to the top of the derivative file saying it was taken under the terms of UNLICENSE (i.e. public domain), but unsure if that would be sufficient. Would including this mean my project won't actually be under the terms of the Apache-or-MIT license?