use rest params for request/response .is

[tinovyatkin]

Using rest params and validation/concatenating logic is built-in into type-is
Also fixes JSDoc declaration

[codecov]

Codecov Report

Merging #1393 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1393   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files           4       4           
  Lines         382     377    -5     
======================================
- Hits          382     377    -5

Impacted Files	Coverage Δ
lib/request.js	100% <100%> (ø)	⬆️
lib/response.js	100% <100%> (ø)	⬆️

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