Doc review, as requested :-).

Mostly just phrasing things differently, which is a matter of taste. Feel free to use or not use any of the changes I'm suggesting.

There's one (very minor) thing that seems like a grammatical error, and not just style issue, though.

`Convert any string (literal, `@`, `&`, `~`) that contains a base64 encoded value, to the byte values it encodes.`

If this structure is going to be used, either the entire clause, 'that contains a base64 encoded value', should be bracketed by commas, or the comma at the end of the clause should be removed.

I think your version, with no edits from me, is still hugely better than the original document, so, whatever :-)

Note: I didn't compile/test this change, because my machine is much, much, slower than yours, so it would take ages, and I'm just editing a few comment strings.