Fix handling cardinality

[k1LoW]

ref: #534

[github-actions]

Code Metrics Report

	main (4bcd621)	#538 (63b82bb)	+/-
Coverage	64.8%	62.8%	-2.0%
Code to Test Ratio	1:0.4	1:0.4	-0.0
Test Execution Time	2m58s	2m57s	-1s

Details

  |                     | main (4bcd621) | #538 (63b82bb) |  +/-  |
  |---------------------|----------------|----------------|-------|
- | Coverage            |          64.8% |          62.8% | -2.0% |
  |   Files             |             36 |             36 |     0 |
  |   Lines             |           3761 |           3764 |    +3 |
- |   Covered           |           2438 |           2365 |   -73 |
- | Code to Test Ratio  |          1:0.4 |          1:0.4 |  -0.0 |
  |   Code              |           9789 |           9795 |    +6 |
  |   Test              |           4063 |           4063 |     0 |
+ | Test Execution Time |          2m58s |          2m57s |   -1s |

Code coverage of files in pull request scope (59.0% → 59.0%)

Files	Coverage	+/-
config/config.go	59.0%	+0.1%

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Reported by octocov