I expected Validated to have an ap method or something, but I can't seem to find it. The only docs I can see are https://github.com/aol/cyclops/wiki/Validator, which clearly isn't the current implementation, and I notice aol/cyclops#826 as another issue, but I don't see the proposed ap method.

Progress indicators for file uploads (specifically indicators for Request objects) would be a great example. At the time of writing, this doesn't seem possible yet, and the Request docs do indicate ReadableStream may be used as a request body

String body: sent

// Post "hello" body.  Browser sends and server res

Maybe we should have something like

static Promise<Uint8Array> compress(DOMString format, BufferSource input);

in CompressionStream, and a similar API for DecompressionStream, to make one-shot compression and decompression easier to do.