There’s been a lot of progress (Temporal, URL, TextDecoder, Base64 encoding, etc.) but there are still gaps.

Math.clamp is a big one (it’s a TC39 proposal). I’d also love to have the stats functions that Python has (geometric mean, median, etc.).

On the more ambitious end: CSV reading/writing and IPv4/IPv6 manipulation.

> On the more ambitious end: CSV reading/writing

Deno's standard libary has nice CSV parsing/serializing, and you can use it in any environment.

Docs: https://docs.deno.com/examples/parsing_serializing_csv/