Step 3 of decompress-and-enqueue step is now invalid?

[saschanaz]

What is the issue with the Compression Standard?

https://compression.spec.whatwg.org/#decompress-and-enqueue-a-chunk

3. If buffer is empty, return.

And then:

6. If the end of the compressed input has been reached, and ds’s context has not fully consumed chunk, then throw a TypeError.

But this algorithm is called after the stream end is reached, step 3 would end the algorithm without throwing an error, making things invalid.

We missed this as Firefox has skipped step 3, as an empty buffer would void step 4 and 5 anyway.

[ricea]

I suggest changing to

3. If buffer is non-empty,
  1. Split
  2. Enqueue
4. If the end ...

Would you like to make a PR?