Fix non-object functional child case for modifying wrapped children i…

[rorticus]

…n test renders (#851)

Type: bug / feature

Backport of 2d95a68 to v7

[codesandbox-ci]

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[codecov]

Codecov Report

Merging #852 into v7 will increase coverage by 0.04%.
The diff coverage is 98.35%.

@@            Coverage Diff             @@
##               v7     #852      +/-   ##
==========================================
+ Coverage   97.52%   97.57%   +0.04%     
==========================================
  Files         126      126              
  Lines        7933     7951      +18     
  Branches     1826     1833       +7     
==========================================
+ Hits         7737     7758      +21     
+ Misses        196      193       -3     

Impacted Files	Coverage Δ
src/core/middleware/resources.ts	98.56% <97.32%> (+<0.01%)	⬆️
src/core/middleware/icache.ts	100.00% <100.00%> (ø)
src/core/vdom.ts	97.99% <100.00%> (+<0.01%)	⬆️
src/testing/decorate.ts	98.01% <100.00%> (+0.01%)	⬆️
src/testing/harness/harness.ts	93.87% <100.00%> (+2.04%)	⬆️
src/testing/renderer.ts	97.69% <100.00%> (+0.11%)	⬆️

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