I was unable to find an APL2 JS polyfill decoder. Does one exist?
If I study the source and then make a single change to my own algorithm to incorporate the secret sauce in order to test its efficacy using my existing test suites, have I infected my own codebase with LPGLv3?
How can I test this code in the real world with real users if I’m not allowed to redistribute it? Would I be required to pay users as contractors to neutralize the redistribution objection?
Etc, etc.
EDIT: Neutralizing LGPLv3 would be necessary to combine this code with GPLv2 code and many other OSF-approved open source licenses, which is why that particular line of reasoning is interesting to me.
If you’re not distributing the result to other people, literally nothing you described matters at all.
As for integrating ideas, as long as you don’t copy actual lines of code, simply learning ideas and techniques from any OSS doesn’t cause license infection.
That’s not evaluating a codec though, is it? You’ve gone far beyond the scope of this thread.