Read arguments & environment variables as bytes?

[jcbhmr]

Sometimes arguments and/or environment variables (names and values) are not UTF-8 strings. This could be because they are binary blobs like PNG data or strings that use a different text encoding.

1. Should that be a consideration of this API?
2. Should runtimes care enough to pursue runtime-specific APIs independent of this proposal to access non-UTF-8 args/env?

The only prior issue I could find was from Node.js nodejs/node#16961 closed due to too many issues, never reopened