* perf(util): handle header array values

* test(*): add array headers tests

* chore(mock-agent): remove skip in headers test

* Test case for fetch() integrity option.

* Implement matchRequestIntegrity

* Add test to cover encoded body

* Speed up integrity test completion

* Fix trailing spaces

`File` ignored the `byteOffset` and `byteLength` properties of typed
arrays, meaning the entire backing `ArrayBuffer` was included.
Notably, this caused issues when passing `Buffer`s to the `File`
constructor.

* fix: don't timeout while waiting for client to send request

When e.g. uploading a large file from the client one would always
get a headers timeout even though everything was working and the file
was being in progress of sending.

* fixuP