threerings/flump — comment on commit 3f85e3733afbd1aa33284a98274e6e51d7941ca1
File:  line 0
By groves:

This change is broken in a couple ways. Non-flipbook movies aren't required to be exported, so movie.symbol will be null in that case. References to movies in the XFL are by their library item name, not their symbol, so this lookup will fail if those are different.

XflLibrary should probably explicitly distinguish between library item lookup and symbol lookup to make this clearer.