Fix Float16Array constructor for SharedArrayBuffer

[petamoriken]

Fixes #1024

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (3b6ab31) 87.02% compared to head (46b82d7) 87.04%.
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1025      +/-   ##
==========================================
+ Coverage   87.02%   87.04%   +0.01%     
==========================================
  Files          12       12              
  Lines         771      772       +1     
  Branches      146      147       +1     
==========================================
+ Hits          671      672       +1     
  Misses         54       54              
  Partials       46       46              

Flag	Coverage Δ
unittests	87.04% <100.00%> (+0.01%)	⬆️

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Files Changed	Coverage Δ
src/Float16Array.mjs	87.44% <100.00%> (ø)
src/_util/is.mjs	94.28% <100.00%> (+0.16%)	⬆️

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