Measure coverage

[goccy]

T/O

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@1a0d195). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #1   +/-   ##
=========================================
  Coverage          ?   88.80%           
=========================================
  Files             ?        5           
  Lines             ?      509           
  Branches          ?        0           
=========================================
  Hits              ?      452           
  Misses            ?       56           
  Partials          ?        1           

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