[refactor] use NumericValue for lib/go: sum

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.06% (target: -1.00%)	:white_check_mark: 100.00%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (d9cb857ed3e4f4f125ff843303a5ea4b328bfa91) | 4571 | 4180 | 91.45% | | | Head commit (40cb0798967ece5f7b17866079b9d6ea92786522) | 4578 (+7) | 4189 (+9) | 91.50% (**+0.06%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#94) | 13 | 13 | **100.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.93%. Comparing base (d9cb857) to head (40cb079).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #94 +/- ## ========================================== + Coverage 88.85% 88.93% +0.08% ========================================== Files 38 38 Lines 4440 4447 +7 ========================================== + Hits 3945 3955 +10 + Misses 384 382 -2 + Partials 111 110 -1 ```

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