canonical form for headers: fast path for 0 headers #344
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Motivation:
It's quite common that someone asks for the canonical form of a header
and we don't have any header values. There's no need to do string
comparisons then, we can just return an empty array.
Modifications:
Check if we're asking for a header that isn't present and if so, just
return the empty array.
Result:
Should be ever so slightly faster.