Thanks for doing this!

I had to convert a ReadableSteam to base64 recently, and I was shocked at how much boilerplate it required in 2023:

    if (isReadableStream<Uint8Array>(value)) {
      const chunks = [];

      for await (const chunk of value) {
        chunks.push(chunk);
      }

      if (chunks[0].byteLength) {
        const length = chunks.reduce(
          (agg, next) => agg + next.length, 0
        );

        // Make the same species TypedArray that ReadableStream gave us.
        value = new (chunks[0].constructor as Uint8ArrayConstructor)(length);

        for (let i = 0, offset = 0; i < chunks.length; i++) {
          value.set(chunks[i], offset);
          offset += chunks[i].length;
        }
      } else {
        throw new Error(`Unrecognized readable stream type: ${ chunks[0].constructor.name }`);
      }
    }

    return  `data:application/octet-stream;base64,${
      btoa(
        (value as Uint8Array).reduce(
          (result, charCode) => result + String.fromCharCode(charCode),
          ''
        )
      )
    }`;

I had to learn/implement a lot of little details to simply change the encoding from binary to its most common text representation. That's a day I would have rather spent doing product work.