fix: merge object strings of many types

[danielroe]

resolves #41

[codecov]

Codecov Report

Merging #44 (57a6f50) into main (c21b132) will decrease coverage by 38.46%.
The diff coverage is 42.85%.

❗ Current head 57a6f50 differs from pull request most recent head ac83cf1. Consider uploading reports for the commit ac83cf1 to get more accurate results

@@             Coverage Diff              @@
##              main      #44       +/-   ##
============================================
- Coverage   100.00%   61.53%   -38.47%     
============================================
  Files            1        1               
  Lines           33       65       +32     
  Branches        10       25       +15     
============================================
+ Hits            33       40        +7     
- Partials         0       25       +25     

Impacted Files	Coverage Δ
src/defu.ts	61.53% <42.85%> (-38.47%)	⬇️

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