Cast inputs to a common dtype

[hombit]

Fix #509 for some single light-curve methods

[codspeed-hq]

CodSpeed Performance Report

Merging #512 will not alter performance

_{Comparing asarray (a627526) with master (e08e203)}

Summary

✅ 106 untouched benchmarks

[codecov]

Codecov Report

Attention: Patch coverage is 95.16129% with 9 lines in your changes missing coverage. Please review.

Project coverage is 83.03%. Comparing base (e08e203) to head (a627526).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
light-curve/src/np_array.rs	96.29%	6 Missing ⚠️
light-curve/src/features.rs	80.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #512      +/-   ##
==========================================
+ Coverage   81.81%   83.03%   +1.21%     
==========================================
  Files           9        9              
  Lines        2579     2729     +150     
==========================================
+ Hits         2110     2266     +156     
+ Misses        469      463       -6     

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