Fix the typedarray problem on the JS side

[disberd]

We have to tackle the typedarray problem on the JS side, as avoiding conversion to Float32 still creates some Float64 typed array on JS.
We simply transforms all of these into normal array once the data has been transfered to JS.

This will hopfully fix #25 and #29 for good

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (a588e5c) 88.05% compared to head (dec0007) 84.95%.

❗ Current head dec0007 differs from pull request most recent head ccca82c. Consider uploading reports for the commit ccca82c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
- Coverage   88.05%   84.95%   -3.11%     
==========================================
  Files          11       11              
  Lines         201      206       +5     
==========================================
- Hits          177      175       -2     
- Misses         24       31       +7     

Files	Coverage Δ
src/show.jl	100.00% <ø> (ø)
src/preprocess.jl	86.27% <28.57%> (-9.38%)	⬇️

... and 1 file with indirect coverage changes

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