Adress some late codereview feedback on #238

[robbertvanginkel]

There were some late comments on #238, addressing them here.

[codecov]

Codecov Report

Merging #240 into dev will decrease coverage by <.01%.
The diff coverage is 95.65%.

@@            Coverage Diff             @@
##              dev     #240      +/-   ##
==========================================
- Coverage   93.89%   93.88%   -0.01%     
==========================================
  Files          42       42              
  Lines        2308     2306       -2     
==========================================
- Hits         2167     2165       -2     
  Misses         88       88              
  Partials       53       53

Impacted Files	Coverage Δ
options.go	94.87% <ø> (ø)	⬆️
transport.go	93.81% <100%> (ø)	⬆️
request.go	100% <100%> (ø)	⬆️
protobuf/filedescriptorsets.go	100% <100%> (ø)	⬆️
encoding/protobuf.go	88.46% <93.33%> (-0.43%)	⬇️

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[kriskowal]

Thank you for circling back for these!