Wow this was surprising. As reported in #448, the `simple.speedscope.json` file failed import. This was surprising to me because there's a test that covers that file to ensure it imports correctly.
The file provided in #448, however, is from a version of speedscope from 5 years ago before the file had been pretty printed. It turns out that when this *particular* file is not pretty-printed, it's a schematically valid pprof profile.
The fix is to do some bounds checks and return null. After the change, the file imports as you'd expect after realizing its not actually a valid pprof profile.
Fixes#448
ac4a015559