Wow, even packages like imaplib and smtplib are included. The whole download is ~6.6 MB. Pretty amazing.
Seem like one can determine what to include and even slim it down a bit, but WASM is certainly an interesting trend. Here is an interesting read on melting the two worlds, takeaways and an overall fascinating use case: https://engineering.q42.nl/webassembly/
PS: I updated the example as input was blocked (small oversight)