Don't call next on dummy; it's not pure

[tkf]

• release Add eltypebyid UnionArrays.jl#25

[codecov]

Codecov Report

Merging #76 (5caeb8d) into master (63968d9) will decrease coverage by 4.27%.
The diff coverage is 3.70%.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
- Coverage   55.48%   51.20%   -4.28%     
==========================================
  Files           2        2              
  Lines         155      166      +11     
==========================================
- Hits           86       85       -1     
- Misses         69       81      +12     

Flag	Coverage Δ
Pkg.test-cpu	?
Run.test-cpu	0.00% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/kernels.jl	49.36% <3.70%> (-4.38%)	⬇️

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