implement optional interfaces dynamically

[CAFxX]

[codecov-io]

Codecov Report

Merging #2 (a8e089c) into master (df607f4) will decrease coverage by 4.13%. The diff coverage is 30.00%.

@@            Coverage Diff             @@
##           master       #2      +/-   ##
==========================================
- Coverage   85.79%   81.66%   -4.14%     
==========================================
  Files          12       13       +1     
  Lines         338      360      +22     
==========================================
+ Hits          290      294       +4     
- Misses         29       47      +18     
  Partials       19       19              

Impacted Files	Coverage Δ
response_writer.go	84.41% <ø> (+2.93%)	:arrow_up:
optional.go	27.58% <27.58%> (ø)
adapter.go	96.72% <100.00%> (-0.16%)	:arrow_down:

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