don't convert vector types unless needed

[baggepinnen]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.68%. Comparing base (3758d8e) to head (255c4ba).

Files with missing lines	Patch %	Lines
src/kalman.jl	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #223      +/-   ##
==========================================
- Coverage   91.72%   91.68%   -0.05%     
==========================================
  Files          21       21              
  Lines        2381     2381              
==========================================
- Hits         2184     2183       -1     
- Misses        197      198       +1     

Flag	Coverage Δ
unittests	91.68% <75.00%> (-0.05%)	⬇️

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