msgpack: optimize

[zchee]

Optimize msgpack package.

[codecov[bot]]

Codecov Report

Merging #95 (2732b5d) into master (7c85d51) will decrease coverage by 0.0%. The diff coverage is 91.4%.

@@           Coverage Diff            @@
##           master     #95     +/-   ##
========================================
- Coverage    80.6%   80.6%   -0.1%     
========================================
  Files          14      14             
  Lines        3044    3048      +4     
========================================
+ Hits         2456    2457      +1     
- Misses        588     591      +3     

Flag	Coverage Δ
linux-1.15-nightly	80.5% <91.4%> (-0.1%)	:arrow_down:
linux-1.15-stable	79.8% <91.4%> (-0.1%)	:arrow_down:
linux-1.16-nightly	80.5% <91.4%> (-0.1%)	:arrow_down:
linux-1.16-stable	79.8% <91.4%> (-0.1%)	:arrow_down:
linux-1.17-nightly	80.5% <91.4%> (-0.1%)	:arrow_down:
linux-1.17-stable	79.8% <91.4%> (-0.1%)	:arrow_down:
macos-1.15-nightly	80.5% <91.4%> (-0.1%)	:arrow_down:
macos-1.15-stable	79.8% <91.4%> (-0.1%)	:arrow_down:
macos-1.16-nightly	80.5% <91.4%> (-0.1%)	:arrow_down:
macos-1.16-stable	79.8% <91.4%> (-0.1%)	:arrow_down:
macos-1.17-nightly	80.5% <91.4%> (-0.1%)	:arrow_down:
macos-1.17-stable	79.8% <91.4%> (-0.1%)	:arrow_down:
windows-1.15-nightly	79.7% <91.4%> (-0.1%)	:arrow_down:
windows-1.15-stable	78.9% <91.4%> (-0.1%)	:arrow_down:
windows-1.16-nightly	79.7% <91.4%> (-0.1%)	:arrow_down:
windows-1.16-stable	78.9% <91.4%> (-0.1%)	:arrow_down:
windows-1.17-nightly	79.7% <91.4%> (-0.1%)	:arrow_down:
windows-1.17-stable	78.9% <91.4%> (-0.1%)	:arrow_down:

Impacted Files	Coverage Δ
msgpack/field.go	76.5% <70.0%> (-1.9%)	:arrow_down:
msgpack/unpack.go	94.3% <100.0%> (ø)

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