I’d like to suggest widening the type of tomllib.load. As the PEP is currently written, load only accepts a file opened in binary mode. The justification is:
Using a binary file allows us to ensure UTF-8 is the encoding used, and avoid incorrectly parsing single carriage returns as valid TOML due to universal newlines in text mode.
This feels overly pedantic to me. It protects against the library accepting some obscure cases that are not strictly valid TOML, but it also makes it so the simplest way to read a TOML file (with open("my.toml") as f: config = tomllib.load(f)) doesn’t work. Also, it means you can’t use io.StringIO to build up a TOML document and then parse it with tomllib.load.
The JSON spec requires JSON to be encoded in UTF-8, but json.load accepts files opened in text mode.