Control flow clarifications/simplifications (and partly minor optimisations/fixes) #14
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Since $encoding is initialised to `identity` and only possibly assigned one of the values of the `for` loop, it can never have a value other than `gzip`, `deflate`, or `identity`.
At this point, $encoding can never have a value other than `gzip` or `deflate`, so this condition will always be true.
Since we are assigning to $encoder unconditionally, it is obviously silly to then check if we have an $encoder.
We always return a response, just not always an encoded one. All we really check for is, does the client accept one of the encodings we make, or does it not. So it is pointless to scan for the `identity` encoding: it is simply among the encodings we do not make.
The `ref` function handle undefined input and always produces a defined output so it is a waste of time to work up to the final check by testing each component subexpression first.
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What it says on the tin.
I also have another inessential commit on top of this branch: a983e2e — Should I add it to this branch/PR?