trust, itemized · regenerated every deploy
Every probe below ran through CPython and through the exact WasmGC build this site serves — stdout compared byte-for-byte. Green means identical output, not "roughly works". The failures stay on the page: this matrix exists to name the boundary, not to hide it.
running the numbers…
The corpus is ~125 small deterministic programs, one per language feature — literals to
match statements, dunder protocols to itertools. The generator runs each
through python3 -I (ground truth) and through pyrun in the same
pyex.wasm deployed to this site, then diffs stdout exactly.
pass = byte-identical · diff = ran, output differs · unsupported = Python-level
error CPython doesn't raise · trap = the compiler doesn't lower that corner yet.
Corpus and generator: ivarvong/pyex_web
app/scripts/conformance*.mjs. The wider pyex test story — differential fuzzing,
repr conformance, 5,073 dectest vectors — lives in
the library repo;
this page measures the wasm build only.