As part as an effort that includes packaging your library for Debian, I'm wondering if it would be possible to have more details or information about which particular files are covered by each original license?

In particular, could you provide some more details regarding these comments on ATTRIB:

Some of this code is ported from dotnet/corefx, which was released under this license:
...

Small pieces of code are copied from the Go framework under this license:
...

I am aware it might be a bit difficult to retrieve that history, but any insight would be much appreciated in the hopes of making sure licenses and copyright are attributed as faithfully as possible. Thanks in advance!