Test CSR on single-precision floating-point values

[mdekstrand]

This tests that CSR works with single-precision floating point arrays.

[codecov]

Codecov Report

Merging #27 (1dd9bcb) into main (a8780b8) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #27   +/-   ##
=======================================
  Coverage   94.74%   94.74%           
=======================================
  Files          19       19           
  Lines        1103     1104    +1     
=======================================
+ Hits         1045     1046    +1     
  Misses         58       58           

Impacted Files	Coverage Δ
csr/test_utils.py	94.80% <100.00%> (+0.06%)	⬆️
csr/transform.py	100.00% <100.00%> (ø)

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