Replace vec(Float64.(collect(val))) by Float64[val...]

[joa-quim]

This avoids an intermediate step involving a (ffffck) Any creation.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.90%. Comparing base (bc54776) to head (074270e).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1911      +/-   ##
==========================================
+ Coverage   85.59%   85.90%   +0.30%     
==========================================
  Files         184      185       +1     
  Lines       26938    27300     +362     
==========================================
+ Hits        23058    23451     +393     
+ Misses       3880     3849      -31     

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