Cleanup type assertion

[mayurkale22]

No description provided.

[codecov-io]

Codecov Report

Merging #525 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #525      +/-   ##
==========================================
- Coverage   95.27%   95.22%   -0.05%     
==========================================
  Files         147      147              
  Lines       10808    10807       -1     
  Branches      907      916       +9     
==========================================
- Hits        10297    10291       -6     
- Misses        511      516       +5

Impacted Files	Coverage Δ
src/common-utils.ts	95.83% <0%> (-4.17%)	⬇️
test/test-zipkin.ts	97.82% <0%> (-2.18%)	⬇️
test/test-jaeger-format.ts	95.38% <0%> (-1.8%)	⬇️
test/test-stackdriver-cloudtrace.ts	98.96% <0%> (-1.04%)	⬇️
test/test-jaeger.ts	98.88% <0%> (-0.39%)	⬇️
src/tracecontext-format.ts	96.42% <0%> (-0.19%)	⬇️
src/trace/model/span.ts	97.91% <0%> (-0.05%)	⬇️
test/test-tracecontext-format.ts	99.06% <0%> (-0.04%)	⬇️
src/http-stats.ts	100% <0%> (ø)	⬆️
src/grpc-stats/client-stats.ts	100% <0%> (ø)	⬆️
... and 7 more

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[mayurkale22]

@draffensperger thanks for the reviews.