correct memory bug

[codecov[bot]]

Codecov Report

Merging #420 (d94ad69) into master (5a15214) will decrease coverage by 0.78%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #420      +/-   ##
==========================================
- Coverage   75.04%   74.26%   -0.78%     
==========================================
  Files         147      147              
  Lines        7981     8113     +132     
==========================================
+ Hits         5989     6025      +36     
- Misses       1992     2088      +96     

Impacted Files	Coverage Δ
src/argparse_setting.jl	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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